638206872884 has 24 divisors (see below), whose sum is σ = 1331909996928. Its totient is φ = 261625177440.

The previous prime is 638206872851. The next prime is 638206872997. The reversal of 638206872884 is 488278602836.

It is a congruent number.

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, 495501587 + ... + 495502874.

It is an arithmetic number, because the mean of its divisors is an integer number (55496249872).

Almost surely, 2^638206872884 is an apocalyptic number.

It is an amenable number.

638206872884 is an abundant number, since it is smaller than the sum of its proper divisors (693703124044).

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

638206872884 is a wasteful number, since it uses less digits than its factorization.

638206872884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991004495 (or 991004493 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 62.

The spelling of 638206872884 in words is "six hundred thirty-eight billion, two hundred six million, eight hundred seventy-two thousand, eight hundred eighty-four".