638407365400 has 48 divisors (see below), whose sum is σ = 1696339574640. Its totient is φ = 218882524800.

The previous prime is 638407365371. The next prime is 638407365413. The reversal of 638407365400 is 4563704836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228001231 + ... + 228004030.

It is an arithmetic number, because the mean of its divisors is an integer number (35340407805).

Almost surely, 2^638407365400 is an apocalyptic number.

It is an amenable number.

638407365400 is an abundant number, since it is smaller than the sum of its proper divisors (1057932209240).

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

638407365400 is a wasteful number, since it uses less digits than its factorization.

638407365400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456005284 (or 456005275 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 638407365400 in words is "six hundred thirty-eight billion, four hundred seven million, three hundred sixty-five thousand, four hundred".