640524172 has 6 divisors (see below), whose sum is σ = 1120917308. Its totient is φ = 320262084.

The previous prime is 640524169. The next prime is 640524211. The reversal of 640524172 is 271425046.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80065518 + ... + 80065525.

Almost surely, 2^640524172 is an apocalyptic number.

It is an amenable number.

640524172 is a deficient number, since it is larger than the sum of its proper divisors (480393136).

640524172 is a wasteful number, since it uses less digits than its factorization.

640524172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160131047 (or 160131045 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 640524172 is about 25308.5790197711. The cubic root of 640524172 is about 862.0090814661.

The spelling of 640524172 in words is "six hundred forty million, five hundred twenty-four thousand, one hundred seventy-two".