638854305304 has 16 divisors (see below), whose sum is σ = 1198177646400. Its totient is φ = 319340266272.

The previous prime is 638854305269. The next prime is 638854305311. The reversal of 638854305304 is 403503458836.

638854305304 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10829544 + ... + 10888375.

It is an arithmetic number, because the mean of its divisors is an integer number (74886102900).

Almost surely, 2^638854305304 is an apocalyptic number.

It is an amenable number.

638854305304 is a deficient number, since it is larger than the sum of its proper divisors (559323341096).

638854305304 is a wasteful number, since it uses less digits than its factorization.

638854305304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21721602 (or 21721598 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 638854305304 in words is "six hundred thirty-eight billion, eight hundred fifty-four million, three hundred five thousand, three hundred four".