638582634264 has 32 divisors (see below), whose sum is σ = 1596930373440. Its totient is φ = 212797706400.

The previous prime is 638582634247. The next prime is 638582634281. The reversal of 638582634264 is 462436285836.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (638582634247) and next prime (638582634281).

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, 3865642 + ... + 4027449.

It is an arithmetic number, because the mean of its divisors is an integer number (49904074170).

Almost surely, 2^638582634264 is an apocalyptic number.

It is an amenable number.

638582634264 is an abundant number, since it is smaller than the sum of its proper divisors (958347739176).

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

638582634264 is a wasteful number, since it uses less digits than its factorization.

638582634264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7896471 (or 7896467 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 57.

The spelling of 638582634264 in words is "six hundred thirty-eight billion, five hundred eighty-two million, six hundred thirty-four thousand, two hundred sixty-four".