638882751072 has 48 divisors (see below), whose sum is σ = 1687109582592. Its totient is φ = 211685696640.

The previous prime is 638882751041. The next prime is 638882751127. The reversal of 638882751072 is 270157288836.

It is a tau number, because it is divible by the number of its divisors (48).

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, 19909204 + ... + 19941267.

It is an arithmetic number, because the mean of its divisors is an integer number (35148116304).

Almost surely, 2^638882751072 is an apocalyptic number.

It is an amenable number.

638882751072 is an abundant number, since it is smaller than the sum of its proper divisors (1048226831520).

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

638882751072 is a wasteful number, since it uses less digits than its factorization.

638882751072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39850651 (or 39850643 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 57.

The spelling of 638882751072 in words is "six hundred thirty-eight billion, eight hundred eighty-two million, seven hundred fifty-one thousand, seventy-two".