640472524 has 24 divisors (see below), whose sum is σ = 1165337600. Its totient is φ = 307668240.

The previous prime is 640472519. The next prime is 640472533. The reversal of 640472524 is 425274046.

640472524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 640472524.

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, 1344 + ... + 35815.

Almost surely, 2^640472524 is an apocalyptic number.

It is an amenable number.

640472524 is a deficient number, since it is larger than the sum of its proper divisors (524865076).

640472524 is a wasteful number, since it uses less digits than its factorization.

640472524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37333 (or 37331 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 640472524 is about 25307.5586337363. The cubic root of 640472524 is about 861.9859117750.

The spelling of 640472524 in words is "six hundred forty million, four hundred seventy-two thousand, five hundred twenty-four".