640613072 has 20 divisors (see below), whose sum is σ = 1354023456. Its totient is φ = 291187680.

The previous prime is 640613041. The next prime is 640613087. The reversal of 640613072 is 270316046.

It is a congruent number.

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, 1819748 + ... + 1820099.

Almost surely, 2^640613072 is an apocalyptic number.

It is an amenable number.

640613072 is an abundant number, since it is smaller than the sum of its proper divisors (713410384).

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

640613072 is a wasteful number, since it uses less digits than its factorization.

640613072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639866 (or 3639860 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 640613072 is about 25310.3352802763. The cubic root of 640613072 is about 862.0489597750.

The spelling of 640613072 in words is "six hundred forty million, six hundred thirteen thousand, seventy-two".