64 (sixty-four) is the natural number following 63 and preceding 65.
Mathematics 64 is a power of two, an interprime, a superperfect number, an Erdős–Woods number, 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.
In other fields 64 is the atomic number of gadolinium.
See also List of powers of two 64-bit computing
References