640325504 has 64 divisors (see below), whose sum is σ = 1570057440. Its totient is φ = 253310976.

The previous prime is 640325503. The next prime is 640325531. The reversal of 640325504 is 405523046.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640325501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15839 + ... + 39134.

Almost surely, 2^640325504 is an apocalyptic number.

640325504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

640325504 is an abundant number, since it is smaller than the sum of its proper divisors (929731936).

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

640325504 is a wasteful number, since it uses less digits than its factorization.

640325504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55007 (or 54995 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 640325504 is about 25304.6538012279. The cubic root of 640325504 is about 861.9199506488.

The spelling of 640325504 in words is "six hundred forty million, three hundred twenty-five thousand, five hundred four".