640594924 has 12 divisors (see below), whose sum is σ = 1132141248. Its totient is φ = 317126000.

The previous prime is 640594883. The next prime is 640594931. The reversal of 640594924 is 429495046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792412 + ... + 793219.

It is an arithmetic number, because the mean of its divisors is an integer number (94345104).

Almost surely, 2^640594924 is an apocalyptic number.

It is an amenable number.

640594924 is a deficient number, since it is larger than the sum of its proper divisors (491546324).

640594924 is a wasteful number, since it uses less digits than its factorization.

640594924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585736 (or 1585734 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 640594924 is about 25309.9767680652. The cubic root of 640594924 is about 862.0408193373.

Subtracting from 640594924 its reverse (429495046), we obtain a triangular number (211099878 = T₂₀₅₄₇).

The spelling of 640594924 in words is "six hundred forty million, five hundred ninety-four thousand, nine hundred twenty-four".