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"Sixty-four" redirects here. For other uses, see
64.
Natural number
64 (sixty-four) is the natural number following 63 and preceding 65.
64 is a power of two, an interprime[1], a superperfect number[2], an Erdős–Woods number[3], a square and a cube.
In four dimensions, there are 64 convex uniform polychora aside from two infinite families of duoprisms and antiprismatic prisms, and 64 Bravais lattices.[4]
A chessboard has 64 squares.
- ^ Sloane, N. J. A. (ed.). "Sequence A024675 (Average of two consecutive odd primes.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2023-11-06.
- ^ Sloane, N. J. A. (ed.). "Sequence A019279 (Superperfect numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Sloane's A059756 : Erdős-Woods numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- ^ Brown, Harold; Bülow, Rolf; Neubüser, Joachim; Wondratschek, Hans; Zassenhaus, Hans (1978), Crystallographic groups of four-dimensional space, New York: Wiley-Interscience [John Wiley & Sons], ISBN 978-0-471-03095-9, MR 0484179
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