64 (number)

64 is the natural number following 63 and preceding 65.

Sixty-four is the square of 8 and the cube of 4. It is the lowest positive power of two that is adjacent to neither a Mersenne prime nor a Fermat prime. It is also a dodecagonal number and a centered triangular number. 64 is a self number.

Sixty-four is also:

The atomic number of gadolinium, a lanthanide.
In some computer programming languages, the size in bits of certain data types.
In China, "64 incident" refers to the Tiananmen Square protests of 1989 which happened on 4 June, 1989.
In chess or draughts, the total number of black and white squares on the game board.
The code for international direct dial calls to New Zealand.
The designation of US Interstate 64, a freeway from Missouri to Virginia.
The subject of the Beatles song "When I'm Sixty-Four"
The registry of the U.S. Navy's aircraft carrier USS Constellation (CV-64)
The number of Braille characters in the old 6-dot system.
The year AD 64, 64 BC, or 1964.
In video games, the Nintendo 64 video game console and the Commodore 64. Since 1996, the number 64 is usually the abbreviation or slang for Nintendo 64.
The maximum number of strokes in any Chinese character.