640375700 has 18 divisors (see below), whose sum is σ = 1389615486. Its totient is φ = 256150240.

The previous prime is 640375699. The next prime is 640375741. The reversal of 640375700 is 7573046.

640375700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 9461776 + 630913924 = 3076^2 + 25118^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3201779 + ... + 3201978.

Almost surely, 2^640375700 is an apocalyptic number.

It is an amenable number.

640375700 is an abundant number, since it is smaller than the sum of its proper divisors (749239786).

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

640375700 is a wasteful number, since it uses less digits than its factorization.

640375700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6403771 (or 6403764 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 640375700 is about 25305.6456151587. The cubic root of 640375700 is about 861.9424724252.

The spelling of 640375700 in words is "six hundred forty million, three hundred seventy-five thousand, seven hundred".