641924920 has 64 divisors (see below), whose sum is σ = 1777648320. Its totient is φ = 203157504.

The previous prime is 641924911. The next prime is 641924971. The reversal of 641924920 is 29429146.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 641924920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84537 + ... + 91816.

It is an arithmetic number, because the mean of its divisors is an integer number (27775755).

Almost surely, 2^641924920 is an apocalyptic number.

It is an amenable number.

641924920 is an abundant number, since it is smaller than the sum of its proper divisors (1135723400).

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

641924920 is a wasteful number, since it uses less digits than its factorization.

641924920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176384 (or 176380 counting only the distinct ones).

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

The square root of 641924920 is about 25336.2372897003. The cubic root of 641924920 is about 862.6369934327.

The spelling of 641924920 in words is "six hundred forty-one million, nine hundred twenty-four thousand, nine hundred twenty".