638525106 has 40 divisors (see below), whose sum is σ = 1432531584. Its totient is φ = 212579640.

The previous prime is 638525053. The next prime is 638525137. The reversal of 638525106 is 601525836.

638525106 is a `hidden beast` number, since 63 + 85 + 2 + 510 + 6 = 666.

638525106 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×638525106² = 815428621984622472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 165111 + ... + 168933.

Almost surely, 2^638525106 is an apocalyptic number.

638525106 is an abundant number, since it is smaller than the sum of its proper divisors (794006478).

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

638525106 is a wasteful number, since it uses less digits than its factorization.

638525106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4868 (or 4859 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 638525106 is about 25269.0543155062. The cubic root of 638525106 is about 861.1113745860. Note that the first 3 decimals are identical.

The spelling of 638525106 in words is "six hundred thirty-eight million, five hundred twenty-five thousand, one hundred six".