# 256 (number)

256 (two hundred [and] fifty-six) is the natural number following 255 and preceding 257.

 ← 255 256 257 →
Cardinaltwo hundred fifty-six
Ordinal256th
(two hundred fifty-sixth)
Factorization28
Greek numeralΣΝϚ´
Roman numeralCCLVI
Binary1000000002
Ternary1001113
Octal4008
Duodecimal19412
Hexadecimal10016

## In mathematics

256 is a composite number, with the factorization 256 = 28, which makes it a power of two.

• 256 is 4 raised to the 4th power, so in tetration notation 256 is 24.
• 256 is a perfect square (162).
• 256 is the only 3-digit number that is zenzizenzizenzic. It is 2 to the 8th power or $((2^{2})^{2})^{2}$ .
• 256 is the lowest number that is a product of eight prime factors.

Removing the digit 6 from 256 yields 25, which is another perfect square.

## In computing

One octet (in most cases one byte) is equal to eight bits and has 28 or 256 possible values, counting from 0 to 255. The number 256 often appears in computer applications (especially on 8-bit systems) such as:

(2256 = 115,792,089,237,316,195,423,570,985,008,687,907,853,269,984,665,640,564,039,457,584,007,913,129,639,936 exactly).

• The number of bits in the SHA-256 cryptographic hash.
• The branding number of nVidia's GeForce 256.

256 is also: