640029264 has 40 divisors (see below), whose sum is σ = 1889611200. Its totient is φ = 182865408.

The previous prime is 640029251. The next prime is 640029289. The reversal of 640029264 is 462920046.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952089 + ... + 952760.

It is an arithmetic number, because the mean of its divisors is an integer number (47240280).

Almost surely, 2^640029264 is an apocalyptic number.

It is an amenable number.

640029264 is an abundant number, since it is smaller than the sum of its proper divisors (1249581936).

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

640029264 is a wasteful number, since it uses less digits than its factorization.

640029264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904867 (or 1904861 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 640029264 is about 25298.7996553196. The cubic root of 640029264 is about 861.7870106827.

The spelling of 640029264 in words is "six hundred forty million, twenty-nine thousand, two hundred sixty-four".