Number

650

650 is a composite number, even, a calendar year.

650 (six hundred fifty) is an even 3-digit number. It is a composite number with 12 divisors, and factors as 2 × 5² × 13. Its proper divisors sum to 652, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is DCL and in binary, 1010001010.

Abundant Number Cube-Free Descending Digits Evil Number Pronic / Oblong Recamán's Sequence Semiperfect Number Square Pyramidal Year

Interestingness

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6 notable facts · grade B

638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662

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Historical context — 650 AD

Calendar year

Year 650 (DCL) was a common year starting on Friday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

Historical context — 650 BC

Calendar year

The year 650 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →

Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Tuesday
January 1, 650
Ended on: Tuesday
December 31, 650
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 650s
650–659
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,376
1376 years before 2026.

In other calendars

Hebrew: 4410 / 4411 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 29 / 30 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Metal zodiac:Dog
Sexagenary cycle position 47 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1193 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 28 / 29 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 642 / 643 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 572 / 571 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 11
Digit product: 0
Digital root: 2
Palindrome: No
Bit width: 10 bits
Reversed: 56
Recamán's sequence: a(2,324) = 650
Square (n²): 422,500
Cube (n³): 274,625,000
Divisor count: 12
σ(n) — sum of divisors: 1,302
φ(n) — Euler's totient: 240
Sum of prime factors: 25

Primality

Prime factorization: 2 × 5 ² × 13

Nearest primes: 647 (−3) · 653 (+3)

Divisors & multiples

All divisors (12)

1 · 2 · 5 · 10 · 13 · 25 · 26 · 50 · 65 · 130 · 325 (half) · 650

Aliquot sum (sum of proper divisors): 652

Factor pairs (a × b = 650)

1 × 650

2 × 325

5 × 130

10 × 65

13 × 50

25 × 26

First multiples

650 · 1,300 (double) · 1,950 · 2,600 · 3,250 · 3,900 · 4,550 · 5,200 · 5,850 · 6,500

Sums & aliquot sequence

As a sum of two squares: 5² + 25² = 11² + 23² = 17² + 19²

As consecutive integers: 161 + 162 + 163 + 164 128 + 129 + 130 + 131 + 132 44 + 45 + … + 56 23 + 24 + … + 42

Aliquot sequence: 650 → 652 → 496 → 496 — reaches a perfect number

Continued fraction of √n

√650 = [25; (2, 50)]

Period length 2 — the block in parentheses repeats forever.

Representations

In words: six hundred fifty
Ordinal: 650th
Roman numeral: DCL
Binary: 1010001010
Octal: 1212
Hexadecimal: 0x28A
Base64: Aoo=
One's complement: 64,885 (16-bit)
Scientific notation: 6.5 × 10²
As a duration: 650 s = 10 minutes, 50 seconds

In other bases

ternary (3) 220002

quaternary (4) 22022

quinary (5) 10100

senary (6) 3002

septenary (7) 1616

nonary (9) 802

undecimal (11) 541

duodecimal (12) 462

tridecimal (13) 3b0

tetradecimal (14) 346

pentadecimal (15) 2d5

Palindromic in base 4

As an angle

650° = 1 × 360° + 290°

290° ≈ 5.061 rad

Compass bearing: WNW (west-northwest)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋 𒌋𒌋𒌋𒌋𒌋
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆
Greek (Milesian): χνʹ
Mayan (base 20): 𝋡·𝋬·𝋪
Chinese: 六百五十
Chinese (financial): 陸佰伍拾

In other modern scripts

Eastern Arabic ٦٥٠ Devanagari ६५० Bengali ৬৫০ Tamil ௬௫௦ Thai ๖๕๐ Tibetan ༦༥༠ Khmer ៦៥០ Lao ໖໕໐ Burmese ၆၅၀

Digit at this position in famous constants

π — Pi (π): Digit 650 = 7
e — Euler's number (e): Digit 650 = 2
φ — Golden ratio (φ): Digit 650 = 1
√2 — Pythagoras's (√2): Digit 650 = 6
ln 2 — Natural log of 2: Digit 650 = 4
γ — Euler-Mascheroni (γ): Digit 650 = 5

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 650, here are decompositions:

3 + 647 = 650
7 + 643 = 650
19 + 631 = 650
31 + 619 = 650
37 + 613 = 650
43 + 607 = 650
73 + 577 = 650
79 + 571 = 650

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Small Letter Upsilon

U+028A

Lowercase letter (Ll)

UTF-8 encoding: CA 8A (2 bytes).

Lookup U+028A on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00028A

RGB(0, 2, 138)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.138.

Address: 0.0.2.138
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.138

Unspecified address (0.0.0.0/8) — "this network" placeholder.

NANP area code 650

The number 650 is an active NANP area code (North American Numbering Plan).

Primary area: San Mateo / Peninsula
Region: California
Country: United States

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 650 ↗

Musical pitch

Heard as a frequency, 650 Hz is closest to:

Concert pitch (A4 = 440 Hz): E5 (659.3 Hz, -24¢)
Scientific pitch (C4 = 256 Hz): E5 (645.1 Hz, +13¢)
Baroque pitch (A4 = 415 Hz): F5 (658.8 Hz, -23¢)