638826900 has 36 divisors (see below), whose sum is σ = 1848340032. Its totient is φ = 170353760.

The previous prime is 638826899. The next prime is 638826913. The reversal of 638826900 is 9628836.

638826900 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×638826900² = 816199616327220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1064412 + ... + 1065011.

Almost surely, 2^638826900 is an apocalyptic number.

638826900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638826900 is an abundant number, since it is smaller than the sum of its proper divisors (1209513132).

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

638826900 is a wasteful number, since it uses less digits than its factorization.

638826900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129440 (or 2129433 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 638826900 is about 25275.0252225393. The cubic root of 638826900 is about 861.2470191160.

The spelling of 638826900 in words is "six hundred thirty-eight million, eight hundred twenty-six thousand, nine hundred".