640636012 has 12 divisors (see below), whose sum is σ = 1121332576. Its totient is φ = 320255280.

The previous prime is 640635967. The next prime is 640636021. The reversal of 640636012 is 210636046.

640636012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 13213 + ... + 38155.

Almost surely, 2^640636012 is an apocalyptic number.

It is an amenable number.

640636012 is a deficient number, since it is larger than the sum of its proper divisors (480696564).

640636012 is a wasteful number, since it uses less digits than its factorization.

640636012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31368 (or 31366 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 640636012 is about 25310.7884507773. The cubic root of 640636012 is about 862.0592494844.

The spelling of 640636012 in words is "six hundred forty million, six hundred thirty-six thousand, twelve".