8640904 has 16 divisors (see below), whose sum is σ = 16477200. Its totient is φ = 4246992.

The previous prime is 8640889. The next prime is 8640911. The reversal of 8640904 is 4090468.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8682 + ... + 9625.

It is an arithmetic number, because the mean of its divisors is an integer number (1029825).

Almost surely, 2^8640904 is an apocalyptic number.

It is an amenable number.

8640904 is a deficient number, since it is larger than the sum of its proper divisors (7836296).

8640904 is a wasteful number, since it uses less digits than its factorization.

8640904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18372 (or 18368 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 8640904 is about 2939.5414608404. The cubic root of 8640904 is about 205.2042699176.

The spelling of 8640904 in words is "eight million, six hundred forty thousand, nine hundred four".