640912632 has 32 divisors (see below), whose sum is σ = 1603158480. Its totient is φ = 213520640.

The previous prime is 640912619. The next prime is 640912661. The reversal of 640912632 is 236219046.

640912632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 640912593 and 640912602.

It is a congruent number.

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, 45148 + ... + 57620.

Almost surely, 2^640912632 is an apocalyptic number.

It is an amenable number.

640912632 is an abundant number, since it is smaller than the sum of its proper divisors (962245848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640912632 is a wasteful number, since it uses less digits than its factorization.

640912632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14623 (or 14619 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 640912632 is about 25316.2523292844. The cubic root of 640912632 is about 862.1833077179.

The spelling of 640912632 in words is "six hundred forty million, nine hundred twelve thousand, six hundred thirty-two".