638936120 has 64 divisors (see below), whose sum is σ = 1509559200. Its totient is φ = 243048960.

The previous prime is 638936117. The next prime is 638936131. The reversal of 638936120 is 21639836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73610 + ... + 81830.

Almost surely, 2^638936120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638936120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (754779600).

638936120 is an abundant number, since it is smaller than the sum of its proper divisors (870623080).

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

638936120 is a wasteful number, since it uses less digits than its factorization.

638936120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8328 (or 8324 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 638936120 is about 25277.1857610771. The cubic root of 638936120 is about 861.2960986810.

The spelling of 638936120 in words is "six hundred thirty-eight million, nine hundred thirty-six thousand, one hundred twenty".