641548944 has 40 divisors (see below), whose sum is σ = 1841484320. Its totient is φ = 213849504.

The previous prime is 641548909. The next prime is 641548961. The reversal of 641548944 is 449845146.

641548944 is a `hidden beast` number, since 64 + 1 + 548 + 9 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 641548944.

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, 742102 + ... + 742965.

It is an arithmetic number, because the mean of its divisors is an integer number (46037108).

Almost surely, 2^641548944 is an apocalyptic number.

It is an amenable number.

641548944 is an abundant number, since it is smaller than the sum of its proper divisors (1199935376).

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

641548944 is a wasteful number, since it uses less digits than its factorization.

641548944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485084 (or 1485072 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 641548944 is about 25328.8164745217. The cubic root of 641548944 is about 862.4685447886.

The spelling of 641548944 in words is "six hundred forty-one million, five hundred forty-eight thousand, nine hundred forty-four".