Number

722

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

Deficient Number Odious Number Pernicious Number Recamán's Sequence Year

Historical context — 722 AD

Calendar year

Year 722 (DCCXXII) was a common year starting on Thursday of the Julian calendar.

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Historical context — 722 BC

Decade

This article concerns the period 729 BC – 720 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: Sunday
January 1, 722
Ended on: Sunday
December 31, 722
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 720s
720–729
Century: 8th century
701–800
Millennium: 1st millennium
1–1000
Years ago: 1,304
1304 years before 2026.

In other calendars

Hebrew: 4482 / 4483 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 103 / 104 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Water zodiac:Dog
Sexagenary cycle position 59 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1265 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 100 / 101 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 714 / 715 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 644 / 643 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 11
Digit product: 28
Digital root: 2
Palindrome: No
Bit width: 10 bits
Reversed: 227
Recamán's sequence: a(231) = 722
Square (n²): 521,284
Cube (n³): 376,367,048
Divisor count: 6
σ(n) — sum of divisors: 1,143
φ(n) — Euler's totient: 342
Sum of prime factors: 40

Primality

Prime factorization: 2 × 19 ²

Nearest primes: 719 (−3) · 727 (+5)

Divisors & multiples

All divisors (6)

1 · 2 · 19 · 38 · 361 (half) · 722

Aliquot sum (sum of proper divisors): 421

Factor pairs (a × b = 722)

1 × 722

2 × 361

19 × 38

First multiples

722 · 1,444 (double) · 2,166 · 2,888 · 3,610 · 4,332 · 5,054 · 5,776 · 6,498 · 7,220

Sums & aliquot sequence

As a sum of two squares: 19² + 19²

As consecutive integers: 179 + 180 + 181 + 182 29 + 30 + … + 47

Aliquot sequence: 722 → 421 → 1 → 0 — terminates at zero

Representations

In words: seven hundred twenty-two
Ordinal: 722nd
Roman numeral: DCCXXII
Binary: 1011010010
Octal: 1322
Hexadecimal: 0x2D2
Base64: AtI=
One's complement: 64,813 (16-bit)

In other bases

ternary (3) 222202

quaternary (4) 23102

quinary (5) 10342

senary (6) 3202

septenary (7) 2051

nonary (9) 882

undecimal (11) 5a7

duodecimal (12) 502

tridecimal (13) 437

tetradecimal (14) 398

pentadecimal (15) 332

Historical numeral systems

Babylonian (base 60): 𒌋𒁹𒁹 𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺
Greek (Milesian): ψκβʹ
Mayan (base 20): 𝋡·𝋰·𝋢
Chinese: 七百二十二
Chinese (financial): 柒佰貳拾貳

In other modern scripts

Eastern Arabic ٧٢٢ Devanagari ७२२ Bengali ৭২২ Tamil ௭௨௨ Thai ๗๒๒ Tibetan ༧༢༢ Khmer ៧២២ Lao ໗໒໒ Burmese ၇၂၂

Digit at this position in famous constants

π — Pi (π): Digit 722 = 8
e — Euler's number (e): Digit 722 = 5
φ — Golden ratio (φ): Digit 722 = 0
√2 — Pythagoras's (√2): Digit 722 = 2
ln 2 — Natural log of 2: Digit 722 = 6
γ — Euler-Mascheroni (γ): Digit 722 = 1

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 722, here are decompositions:

3 + 719 = 722
13 + 709 = 722
31 + 691 = 722
61 + 661 = 722
79 + 643 = 722
103 + 619 = 722
109 + 613 = 722
151 + 571 = 722

Showing the first eight; more decompositions exist.

Unicode codepoint

Modifier Letter Centred Right Half Ring

U+02D2

Modifier symbol (Sk)

UTF-8 encoding: CB 92 (2 bytes).

Lookup U+02D2 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0002D2

RGB(0, 2, 210)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.210.

Address: 0.0.2.210
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.210

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