Number

56

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

Abundant Number Arithmetic Number Odious Number Pernicious Number Practical Number Pronic / Oblong Recamán's Sequence Semiperfect Number Tetrahedral Year

Historical context — 56 AD

Calendar year

AD 56 (LVI) was a leap year starting on Thursday of the Julian calendar.

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Historical context — 56 BC

Calendar year

Year 56 BC was a year of the pre-Julian Roman calendar.

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Year facts

Year type: Leap year
Divisible by 4 and not by 100; February has 29 days.
Days in year: 366
ISO weeks: 52
Started on: Saturday
January 1, 56
Ended on: Sunday
December 31, 56
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 50s
50–59
Century: 1st century
1–100
Millennium: 1st millennium
1–1000
Years ago: 1,970
1970 years before 2026.

In other calendars

Hebrew: 3816 / 3817 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Fire zodiac:Dragon
Sexagenary cycle position 53 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 599 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 48 / 49 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): -22 / -23 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 2
Digit sum: 11
Digit product: 30
Digital root: 2
Palindrome: No
Bit width: 6 bits
Reversed: 65
Recamán's sequence: a(204) = 56
Square (n²): 3,136
Cube (n³): 175,616
Divisor count: 8
σ(n) — sum of divisors: 120
φ(n) — Euler's totient: 24
Sum of prime factors: 13

Primality

Prime factorization: 2 ³ × 7

Nearest primes: 53 (−3) · 59 (+3)

Divisors & multiples

All divisors (8)

1 · 2 · 4 · 7 · 8 · 14 · 28 (half) · 56

Aliquot sum (sum of proper divisors): 64

Factor pairs (a × b = 56)

1 × 56

2 × 28

4 × 14

7 × 8

First multiples

56 · 112 (double) · 168 · 224 · 280 · 336 · 392 · 448 · 504 · 560

Sums & aliquot sequence

As consecutive integers: 5 + 6 + … + 11

Aliquot sequence: 56 → 64 → 63 → 41 → 1 → 0 — terminates at zero

Representations

In words: fifty-six
Ordinal: 56th
Roman numeral: LVI
Binary: 111000
Octal: 70
Hexadecimal: 0x38
Base64: OA==
One's complement: 199 (8-bit)
Scientific notation: 5.6 × 10¹

In other bases

ternary (3) 2002

quaternary (4) 320

quinary (5) 211

senary (6) 132

septenary (7) 110

nonary (9) 62

undecimal (11) 51

duodecimal (12) 48

tridecimal (13) 44

tetradecimal (14) 40

pentadecimal (15) 3b

Palindromic in base 3

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): νϛʹ
Mayan (base 20): 𝋢·𝋰
Chinese: 五十六
Chinese (financial): 伍拾陸

In other modern scripts

Eastern Arabic ٥٦ Devanagari ५६ Bengali ৫৬ Tamil ௫௬ Thai ๕๖ Tibetan ༥༦ Khmer ៥៦ Lao ໕໖ Burmese ၅၆

Digit at this position in famous constants

π — Pi (π): Digit 56 = 9
e — Euler's number (e): Digit 56 = 9
φ — Golden ratio (φ): Digit 56 = 1
√2 — Pythagoras's (√2): Digit 56 = 1
ln 2 — Natural log of 2: Digit 56 = 1
γ — Euler-Mascheroni (γ): Digit 56 = 8

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 56, here are decompositions:

3 + 53 = 56
13 + 43 = 56
19 + 37 = 56

ASCII character

As an ASCII codepoint, 56 is 8. Printable ASCII character 8.

Hex color

#000038

RGB(0, 0, 56)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.56.

Address: 0.0.0.56
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.56

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