640544882 has 16 divisors (see below), whose sum is σ = 967605912. Its totient is φ = 318015360.

The previous prime is 640544867. The next prime is 640544893. The reversal of 640544882 is 288445046.

640544882 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 322956841 + 317588041 = 17971^2 + 17821^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396308 + ... + 397920.

Almost surely, 2^640544882 is an apocalyptic number.

640544882 is a deficient number, since it is larger than the sum of its proper divisors (327061030).

640544882 is a wasteful number, since it uses less digits than its factorization.

640544882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893.

The product of its (nonzero) digits is 245760, while the sum is 41.

The square root of 640544882 is about 25308.9881662622. The cubic root of 640544882 is about 862.0183717820.

The spelling of 640544882 in words is "six hundred forty million, five hundred forty-four thousand, eight hundred eighty-two".