641965884 has 48 divisors (see below), whose sum is σ = 1714137600. Its totient is φ = 183180096.

The previous prime is 641965879. The next prime is 641965931. The reversal of 641965884 is 488569146.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

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, 65922 + ... + 75030.

It is an arithmetic number, because the mean of its divisors is an integer number (35711200).

Almost surely, 2^641965884 is an apocalyptic number.

It is an amenable number.

641965884 is an abundant number, since it is smaller than the sum of its proper divisors (1072171716).

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

641965884 is a wasteful number, since it uses less digits than its factorization.

641965884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9962 (or 9960 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 51.

The square root of 641965884 is about 25337.0456841361. The cubic root of 641965884 is about 862.6553425724.

The spelling of 641965884 in words is "six hundred forty-one million, nine hundred sixty-five thousand, eight hundred eighty-four".