64 (
sixty-four) is the
natural number following
63 and preceding
65.
In mathematics
Sixty-four is the square of
8, the cube of
4, and
the sixth power of
2. It is the smallest
number with exactly seven
divisors. It is
the lowest positive
power of two that
is adjacent to neither a
Mersenne
prime nor a
Fermat prime. 64 is the
sum of
Euler's totient
function for the first fourteen integers. It is also a
dodecagonal number and a
centered triangular number.
Since it is possible to find sequences of 64 consecutive integers
such that each inner member shares a factor with either the first
or the last member, 64 is an
Erdős–Woods number.
In base 10, no integer added up to its own digits yields 64, hence
it is a
self number.
64 is a
superperfect number - a
number such that
σ(σ(
n))=2
n.
In science
Astronomy
In other fields
Sixty-four is:
- In some computer programming languages, the size in bits of
certain data types
- In chess or draughts, the total number of black (dark) and
white (light) squares on the game board
- 64 is the name of the premier
Russian chess magazine
- The
code for
international direct dial calls to New Zealand
- The
designation of US Interstate 64, a
freeway from Missouri to Virginia
- The designation of U.S.
Route 64, a highway from Arizona to North Carolina
- The subject of the Beatles song
"When I'm Sixty-Four"
- The registry of the U.S. Navy's aircraft carrier USS
Constellation
- The number of Braille characters in the
old 6-dot system
- In 8-bit home
computers, a common shorthand for the Commodore 64
- In video games, the Nintendo 64 video
game console and (historically) the Commodore 64. Since 1996, the number 64 has
been an abbreviation or slang for Nintendo 64 (though N64
is more common)
- The maximum number of stroke in any Chinese character
- Number of hexagrams in the I Ching
- Number of sexual positions in the Kama
Sutra
- Number of demons in the Dictionnaire Infernal
- Slang term referring to a 1964 Chevrolet Impala, often configured as a
lowrider, a popular subject among
early-90's gangsta rap and today very
popular in Dirty South H-Town rap, eg. by rappers such as Paul Wall, Mike
Jones, etc.
- The number of classical arts listed in many Indian scriptures.
They include: singing, dancing, painting, poetry, playing cards,
making arguments, making flower garlands, etc.
- The
number of the French department
Pyrénées-Atlantiques
- The amount of crayons in the popular Crayola 64 pack
- Base 64 is used for example with
Base64 encoding.
- 64 is a character in the Donald Duck comics
universe.
- Number of codons in the RNA codon table under genetic code.
Historical years
64 A.D.,
64
B.C.,
1964,
2064,
etc.
See also