64645664 has 24 divisors (see below), whose sum is σ = 131378688. Its totient is φ = 31279680.

The previous prime is 64645649. The next prime is 64645681. The reversal of 64645664 is 46654646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31592 + ... + 33575.

It is an arithmetic number, because the mean of its divisors is an integer number (5474112).

Almost surely, 2^64645664 is an apocalyptic number.

It is an amenable number.

64645664 is an abundant number, since it is smaller than the sum of its proper divisors (66733024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64645664 is a wasteful number, since it uses less digits than its factorization.

64645664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65208 (or 65200 counting only the distinct ones).

The product of its digits is 414720, while the sum is 41.

The square root of 64645664 is about 8040.2527323462. The cubic root of 64645664 is about 401.3406350576.

The spelling of 64645664 in words is "sixty-four million, six hundred forty-five thousand, six hundred sixty-four".