640904705232 has 80 divisors (see below), whose sum is σ = 1835795686080. Its totient is φ = 191029708800.

The previous prime is 640904705227. The next prime is 640904705249. The reversal of 640904705232 is 232507409046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9917257 + ... + 9981672.

It is an arithmetic number, because the mean of its divisors is an integer number (22947446076).

Almost surely, 2^640904705232 is an apocalyptic number.

It is an amenable number.

640904705232 is an abundant number, since it is smaller than the sum of its proper divisors (1194890980848).

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

640904705232 is a wasteful number, since it uses less digits than its factorization.

640904705232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19899012 (or 19899006 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 640904705232 in words is "six hundred forty billion, nine hundred four million, seven hundred five thousand, two hundred thirty-two".