Number

622

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

Arithmetic Number Deficient Number Evil Number Happy Number Recamán's Sequence Semiprime Squarefree Year

Notable events — 622 AD

Jul 16 Muhammad's Hijra from Mecca to Medina — year 1 of the Islamic calendar.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

Historical context — 622 BC

Calendar year

The year 622 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback 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, 622
Ended on: Tuesday
December 31, 622
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 620s
620–629
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,404
1404 years before 2026.

In other calendars

Hebrew: 4382 / 4383 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Horse
Sexagenary cycle position 19 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1165 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 614 / 615 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 544 / 543 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 10
Digit product: 24
Digital root: 1
Palindrome: No
Bit width: 10 bits
Reversed: 226
Recamán's sequence: a(8,896) = 622
Square (n²): 386,884
Cube (n³): 240,641,848
Divisor count: 4
σ(n) — sum of divisors: 936
φ(n) — Euler's totient: 310
Sum of prime factors: 313

Primality

Prime factorization: 2 × 311

Nearest primes: 619 (−3) · 631 (+9)

Divisors & multiples

All divisors (4)

1 · 2 · 311 (half) · 622

Aliquot sum (sum of proper divisors): 314

Factor pairs (a × b = 622)

1 × 622

2 × 311

First multiples

622 · 1,244 (double) · 1,866 · 2,488 · 3,110 · 3,732 · 4,354 · 4,976 · 5,598 · 6,220

Sums & aliquot sequence

As consecutive integers: 154 + 155 + 156 + 157

Aliquot sequence: 622 → 314 → 160 → 218 → 112 → 136 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: six hundred twenty-two
Ordinal: 622nd
Roman numeral: DCXXII
Binary: 1001101110
Octal: 1156
Hexadecimal: 0x26E
Base64: Am4=
One's complement: 64,913 (16-bit)

In other bases

ternary (3) 212001

quaternary (4) 21232

quinary (5) 4442

senary (6) 2514

septenary (7) 1546

nonary (9) 761

undecimal (11) 516

duodecimal (12) 43a

tridecimal (13) 38b

tetradecimal (14) 326

pentadecimal (15) 2b7

Historical numeral systems

Babylonian (base 60): 𒌋 𒌋𒌋𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺
Greek (Milesian): χκβʹ
Mayan (base 20): 𝋡·𝋫·𝋢
Chinese: 六百二十二
Chinese (financial): 陸佰貳拾貳

In other modern scripts

Eastern Arabic ٦٢٢ Devanagari ६२२ Bengali ৬২২ Tamil ௬௨௨ Thai ๖๒๒ Tibetan ༦༢༢ Khmer ៦២២ Lao ໖໒໒ Burmese ၆၂၂

Digit at this position in famous constants

π — Pi (π): Digit 622 = 7
e — Euler's number (e): Digit 622 = 7
φ — Golden ratio (φ): Digit 622 = 2
√2 — Pythagoras's (√2): Digit 622 = 8
ln 2 — Natural log of 2: Digit 622 = 4
γ — Euler-Mascheroni (γ): Digit 622 = 4

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 622, here are decompositions:

3 + 619 = 622
5 + 617 = 622
23 + 599 = 622
29 + 593 = 622
53 + 569 = 622
59 + 563 = 622
101 + 521 = 622
113 + 509 = 622

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Small Letter Lezh

U+026E

Lowercase letter (Ll)

UTF-8 encoding: C9 AE (2 bytes).

Lookup U+026E on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00026E

RGB(0, 2, 110)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.110.

Address: 0.0.2.110
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.110

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