638564490084 has 48 divisors (see below), whose sum is σ = 1530794922048. Its totient is φ = 207028741248.

The previous prime is 638564490061. The next prime is 638564490127. The reversal of 638564490084 is 480094465836.

638564490084 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1009354 + ... + 1515230.

It is an arithmetic number, because the mean of its divisors is an integer number (31891560876).

Almost surely, 2^638564490084 is an apocalyptic number.

It is an amenable number.

638564490084 is an abundant number, since it is smaller than the sum of its proper divisors (892230431964).

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

638564490084 is a wasteful number, since it uses less digits than its factorization.

638564490084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508764 (or 508762 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 57.

The spelling of 638564490084 in words is "six hundred thirty-eight billion, five hundred sixty-four million, four hundred ninety thousand, eighty-four".