640532924 has 24 divisors (see below), whose sum is σ = 1128275568. Its totient is φ = 318176000.

The previous prime is 640532917. The next prime is 640532927. The reversal of 640532924 is 429235046.

640532924 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640532927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655124 + ... + 656100.

It is an arithmetic number, because the mean of its divisors is an integer number (47011482).

Almost surely, 2^640532924 is an apocalyptic number.

It is an amenable number.

640532924 is a deficient number, since it is larger than the sum of its proper divisors (487742644).

640532924 is a wasteful number, since it uses less digits than its factorization.

640532924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885 (or 1883 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 640532924 is about 25308.7519249765. The cubic root of 640532924 is about 862.0130075574.

The spelling of 640532924 in words is "six hundred forty million, five hundred thirty-two thousand, nine hundred twenty-four".