641920924 has 12 divisors (see below), whose sum is σ = 1147263264. Its totient is φ = 314131424.

The previous prime is 641920919. The next prime is 641920943. The reversal of 641920924 is 429029146.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1707049 + ... + 1707424.

It is an arithmetic number, because the mean of its divisors is an integer number (95605272).

Almost surely, 2^641920924 is an apocalyptic number.

It is an amenable number.

641920924 is a deficient number, since it is larger than the sum of its proper divisors (505342340).

641920924 is a wasteful number, since it uses less digits than its factorization.

641920924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414524 (or 3414522 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 641920924 is about 25336.1584301962. The cubic root of 641920924 is about 862.6352034494.

The spelling of 641920924 in words is "six hundred forty-one million, nine hundred twenty thousand, nine hundred twenty-four".