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Number

256

256 — Two to the Eighth

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

Two hundred fifty-six equals (2^8), making it the number of distinct values an unsigned 8-bit byte can represent. It is fundamental to computing.

Sources https://en.wikipedia.org/wiki/256_(number)
Curated Deficient Number Perfect Square Power of Two Powerful Number computing

Properties

Parity
Even
Digit count
3
Digit sum
13
Digital root
4
Palindrome
No
Divisor count
9
σ(n) — sum of divisors
511

Primality

Prime factorization: 2 8

Divisors & multiples

All divisors (9)
1 · 2 · 4 · 8 · 16 · 32 · 64 · 128 · 256
Aliquot sum (sum of proper divisors): 255
Factor pairs (a × b = 256)
1 × 256
2 × 128
4 × 64
8 × 32
16 × 16
First multiples
256 · 512 · 768 · 1,024 · 1,280 · 1,536 · 1,792 · 2,048 · 2,304 · 2,560

Representations

In words
two hundred fifty-six
Ordinal
256th
Roman numeral
CCLVI
Binary
100000000
Octal
400
Hexadecimal
100

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 256, here are decompositions:

  • 5 + 251 = 256
  • 17 + 239 = 256
  • 23 + 233 = 256
  • 29 + 227 = 256
  • 59 + 197 = 256
  • 83 + 173 = 256
  • 89 + 167 = 256
  • 107 + 149 = 256

Showing the first eight; more decompositions exist.

Unicode codepoint
Ā
U+0100
Uppercase letter (Lu)

UTF-8 encoding: C4 80 (2 bytes).

Lookup U+0100 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#000100
RGB(0, 1, 0)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.0.