638407567812 has 24 divisors (see below), whose sum is σ = 1702420181056. Its totient is φ = 182402162208.

The previous prime is 638407567807. The next prime is 638407567823. The reversal of 638407567812 is 218765704836.

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, 3800044963 + ... + 3800045130.

Almost surely, 2^638407567812 is an apocalyptic number.

It is an amenable number.

638407567812 is an abundant number, since it is smaller than the sum of its proper divisors (1064012613244).

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

638407567812 is a wasteful number, since it uses less digits than its factorization.

638407567812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7600090107 (or 7600090105 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 57.

The spelling of 638407567812 in words is "six hundred thirty-eight billion, four hundred seven million, five hundred sixty-seven thousand, eight hundred twelve".