640630204 has 6 divisors (see below), whose sum is σ = 1121102864. Its totient is φ = 320315100.

The previous prime is 640630187. The next prime is 640630223. The reversal of 640630204 is 402036046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80078772 + ... + 80078779.

Almost surely, 2^640630204 is an apocalyptic number.

It is an amenable number.

640630204 is a deficient number, since it is larger than the sum of its proper divisors (480472660).

640630204 is a wasteful number, since it uses less digits than its factorization.

640630204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160157555 (or 160157553 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 640630204 is about 25310.6737168334. The cubic root of 640630204 is about 862.0566443362.

The spelling of 640630204 in words is "six hundred forty million, six hundred thirty thousand, two hundred four".