Number

679

679 is a composite number, odd, a calendar year.

Arithmetic Number Ascending Digits Deficient Number Evil Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 679 AD

Calendar year

Year 679 (DCLXXIX) was a common year starting on Saturday of the Julian calendar.

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Historical context — 679 BC

Decade

The 670s BC, or 670s BCE are the decade that runs from 679 BC to 670 BC.

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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: Wednesday
January 1, 679
Ended on: Wednesday
December 31, 679
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 670s
670–679
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,347
1347 years before 2026.

In other calendars

Hebrew: 4439 / 4440 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 59 / 60 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Earth zodiac:Rabbit
Sexagenary cycle position 16 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1222 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 57 / 58 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 671 / 672 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 601 / 600 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 22
Digit product: 378
Digital root: 4
Palindrome: No
Bit width: 10 bits
Reversed: 976
Recamán's sequence: a(2,266) = 679
Square (n²): 461,041
Cube (n³): 313,046,839
Divisor count: 4
σ(n) — sum of divisors: 784
φ(n) — Euler's totient: 576
Sum of prime factors: 104

Primality

Prime factorization: 7 × 97

Nearest primes: 677 (−2) · 683 (+4)

Divisors & multiples

All divisors (4)

1 · 7 · 97 · 679

Aliquot sum (sum of proper divisors): 105

Factor pairs (a × b = 679)

1 × 679

7 × 97

First multiples

679 · 1,358 (double) · 2,037 · 2,716 · 3,395 · 4,074 · 4,753 · 5,432 · 6,111 · 6,790

Sums & aliquot sequence

As consecutive integers: 339 + 340 94 + 95 + … + 100 42 + 43 + … + 55

Aliquot sequence: 679 → 105 → 87 → 33 → 15 → 9 → 4 → 3 → 1 → 0 — terminates at zero

Representations

In words: six hundred seventy-nine
Ordinal: 679th
Roman numeral: DCLXXIX
Binary: 1010100111
Octal: 1247
Hexadecimal: 0x2A7
Base64: Aqc=
One's complement: 64,856 (16-bit)

In other bases

ternary (3) 221011

quaternary (4) 22213

quinary (5) 10204

senary (6) 3051

septenary (7) 1660

nonary (9) 834

undecimal (11) 568

duodecimal (12) 487

tridecimal (13) 403

tetradecimal (14) 367

pentadecimal (15) 304

Historical numeral systems

Babylonian (base 60): 𒌋𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): χοθʹ
Mayan (base 20): 𝋡·𝋭·𝋳
Chinese: 六百七十九
Chinese (financial): 陸佰柒拾玖

In other modern scripts

Eastern Arabic ٦٧٩ Devanagari ६७९ Bengali ৬৭৯ Tamil ௬௭௯ Thai ๖๗๙ Tibetan ༦༧༩ Khmer ៦៧៩ Lao ໖໗໙ Burmese ၆၇၉

Digit at this position in famous constants

π — Pi (π): Digit 679 = 5
e — Euler's number (e): Digit 679 = 1
φ — Golden ratio (φ): Digit 679 = 7
√2 — Pythagoras's (√2): Digit 679 = 0
ln 2 — Natural log of 2: Digit 679 = 4
γ — Euler-Mascheroni (γ): Digit 679 = 2

Also seen as

Unicode codepoint

Latin Small Letter Tesh Digraph

U+02A7

Lowercase letter (Ll)

UTF-8 encoding: CA A7 (2 bytes).

Lookup U+02A7 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0002A7

RGB(0, 2, 167)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.167.

Address: 0.0.2.167
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.167

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