644270868132 has 24 divisors (see below), whose sum is σ = 1503323426976. Its totient is φ = 214753422528.

The previous prime is 644270868113. The next prime is 644270868173. The reversal of 644270868132 is 231868072446.

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, 379023 + ... + 1196745.

It is an arithmetic number, because the mean of its divisors is an integer number (62638476124).

Almost surely, 2^644270868132 is an apocalyptic number.

It is an amenable number.

644270868132 is an abundant number, since it is smaller than the sum of its proper divisors (859052558844).

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

644270868132 is a wasteful number, since it uses less digits than its factorization.

644270868132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883387 (or 883385 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 644270868132 in words is "six hundred forty-four billion, two hundred seventy million, eight hundred sixty-eight thousand, one hundred thirty-two".