64 (number) 64 (number) 64 (sixty-four) is the natural number following 63 and preceding 65. 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. 64 is also the first whole number that is both a perfect square and a perfect cube. Since
Cube (algebra) of a number or any other mathematical expression is denoted by a superscript 3, for example or . The graph of the cube function f: "x" → "x" (or the equation "y" = "x") is known as the cubic parabola. Because cube is an odd function, this curve has a point of symmetry in the origin, but no axis of symmetry. A cube number, or a perfect cube, or sometimes just a cube, is a number which is the cube of an integer. The perfect cubes up to 60 are : Geometrically speaking, a positive integer is a perfect cube