640576924 has 36 divisors (see below), whose sum is σ = 1234525320. Its totient is φ = 290621760.

The previous prime is 640576903. The next prime is 640576939. The reversal of 640576924 is 429675046.

It is a happy number.

It is a super-2 number, since 2×640576924² = 820677591122603552, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31854 + ... + 47914.

It is an arithmetic number, because the mean of its divisors is an integer number (34292370).

Almost surely, 2^640576924 is an apocalyptic number.

It is an amenable number.

640576924 is a deficient number, since it is larger than the sum of its proper divisors (593948396).

640576924 is a wasteful number, since it uses less digits than its factorization.

640576924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16150 (or 16135 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 640576924 is about 25309.6211745652. The cubic root of 640576924 is about 862.0327451345.

The spelling of 640576924 in words is "six hundred forty million, five hundred seventy-six thousand, nine hundred twenty-four".