638865330884 has 48 divisors (see below), whose sum is σ = 1273958824320. Its totient is φ = 277657578240.

The previous prime is 638865330869. The next prime is 638865330941. The reversal of 638865330884 is 488033568836.

It is a super-2 number, since 2×638865330884² (a number of 24 digits) contains 22 as substring.

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, 2299049 + ... + 2561904.

It is an arithmetic number, because the mean of its divisors is an integer number (26540808840).

Almost surely, 2^638865330884 is an apocalyptic number.

It is an amenable number.

638865330884 is a deficient number, since it is larger than the sum of its proper divisors (635093493436).

638865330884 is a wasteful number, since it uses less digits than its factorization.

638865330884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861100 (or 4861098 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 62.

The spelling of 638865330884 in words is "six hundred thirty-eight billion, eight hundred sixty-five million, three hundred thirty thousand, eight hundred eighty-four".