640760524 has 12 divisors (see below), whose sum is σ = 1151637424. Its totient is φ = 311721264.

The previous prime is 640760521. The next prime is 640760543. The reversal of 640760524 is 425067046.

It is a self number, because there is not a number n which added to its sum of digits gives 640760524.

It is not an unprimeable number, because it can be changed into a prime (640760521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2164584 + ... + 2164879.

Almost surely, 2^640760524 is an apocalyptic number.

It is an amenable number.

640760524 is a deficient number, since it is larger than the sum of its proper divisors (510876900).

640760524 is a wasteful number, since it uses less digits than its factorization.

640760524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4329504 (or 4329502 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 640760524 is about 25313.2479938865. The cubic root of 640760524 is about 862.1150949079.

The spelling of 640760524 in words is "six hundred forty million, seven hundred sixty thousand, five hundred twenty-four".