638632386274 has 8 divisors (see below), whose sum is σ = 961923470508. Its totient is φ = 317991229440.

The previous prime is 638632386253. The next prime is 638632386299. The reversal of 638632386274 is 472683236836.

It can be written as a sum of positive squares in 2 ways, for example, as 579798488025 + 58833898249 = 761445^2 + 242557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662481247 + ... + 662482210.

Almost surely, 2^638632386274 is an apocalyptic number.

638632386274 is a deficient number, since it is larger than the sum of its proper divisors (323291084234).

638632386274 is a wasteful number, since it uses less digits than its factorization.

638632386274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324963700.

The product of its digits is 41803776, while the sum is 58.

The spelling of 638632386274 in words is "six hundred thirty-eight billion, six hundred thirty-two million, three hundred eighty-six thousand, two hundred seventy-four".