640346604 has 24 divisors (see below), whose sum is σ = 1516444608. Its totient is φ = 210262800.

The previous prime is 640346563. The next prime is 640346617. The reversal of 640346604 is 406643046.

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, 397422 + ... + 399029.

It is an arithmetic number, because the mean of its divisors is an integer number (63185192).

Almost surely, 2^640346604 is an apocalyptic number.

It is an amenable number.

640346604 is an abundant number, since it is smaller than the sum of its proper divisors (876098004).

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

640346604 is a wasteful number, since it uses less digits than its factorization.

640346604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796525 (or 796523 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 640346604 is about 25305.0707171507. The cubic root of 640346604 is about 861.9294178709.

The spelling of 640346604 in words is "six hundred forty million, three hundred forty-six thousand, six hundred four".