638882964576 has 36 divisors (see below), whose sum is σ = 1816823431332. Its totient is φ = 212960988096.

The previous prime is 638882964547. The next prime is 638882964581. The reversal of 638882964576 is 675469288836.

638882964576 is a `hidden beast` number, since 6 + 3 + 8 + 8 + 82 + 96 + 457 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1109171526 + ... + 1109172101.

It is an arithmetic number, because the mean of its divisors is an integer number (50467317537).

Almost surely, 2^638882964576 is an apocalyptic number.

It is an amenable number.

638882964576 is an abundant number, since it is smaller than the sum of its proper divisors (1177940466756).

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

638882964576 is a wasteful number, since it uses less digits than its factorization.

638882964576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218343643 (or 2218343632 counting only the distinct ones).

The product of its digits is 836075520, while the sum is 72.

The spelling of 638882964576 in words is "six hundred thirty-eight billion, eight hundred eighty-two million, nine hundred sixty-four thousand, five hundred seventy-six".