256 (number)

← 255 256 257 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred fifty-six
Ordinal	256th (two hundred and fifty-sixth)
Factorization	28
Roman numeral	CCLVI
Binary	1000000002
Ternary	1001113
Quaternary	100004
Quinary	20115
Senary	11046
Octal	4008
Duodecimal	19412
Hexadecimal	10016
Vigesimal	CG20
Base 36	7436

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

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.

In computing

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:

• The typical number of different values in each color channel of a digital color image (256 values for red, 256 values for green, and 256 values for blue used for 24-bit color) (see color space).
• The number of colors available in a GIF or a 256-color (8-bit) bitmap.
• The number of characters in extended ASCII and Latin-1.
• The number of columns available in a Microsoft Excel worksheet until Excel 2007.
• The split-screen level in Pacman, which results from the use of a single byte to store the internal level counter.
• A 256-bit integer can represent up to 1.1579209e+77 values.
• Number of bits in the SHA-256 cryptographic hash.
• The branding number of nVidia's GeForce 256

In other fields

256 is also:

• The number of characters in the new Braille 8-dot system.
• An area code in Alabama.
• The number of NFL regular season football games.
• The frequency of Middle C in hertz under scientific pitch.
• The number of the Amarna letter (EA256), which, according to David Rohl, was written by Ishbaal and contains mentions of King David, Jesse, and Joab.
• The number of captured Viet Cong in the song "Three-Five-Zero-Zero" of the musical Hair.
• The number of soldiers in the most basic unit (the syntagma) of the Macedonian army.
• The number used by short track speed skating Olympian Apolo Ohno.
• The number of players online in Domination mode in the game MAG.
• The number of Catch Cards in the video game Super Paper Mario.
• The number value in Hebrew Gematria of the word רָנּוּ (ronna) (meaning "sing"), which appears in Jeremiah 31:6, "Sing with gladness for Jacob," and was associated with a prophecy of the return of the Messiah in the Hebrew year 4856 (1095–1096), which was close to the 256th lunar cycle (each cycle lasting 19 years), when the Jews were persecuted during the First Crusade.