638850816 has 54 divisors (see below), whose sum is σ = 1841971040. Its totient is φ = 212949504.

The previous prime is 638850809. The next prime is 638850833. The reversal of 638850816 is 618058836.

638850816 is a `hidden beast` number, since 63 + 88 + 508 + 1 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 136336 + ... + 140943.

Almost surely, 2^638850816 is an apocalyptic number.

It is an amenable number.

638850816 is an abundant number, since it is smaller than the sum of its proper divisors (1203120224).

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

638850816 is a wasteful number, since it uses less digits than its factorization.

638850816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277301 (or 277284 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 638850816 is about 25275.4983333662. The cubic root of 638850816 is about 861.2577665901.

The spelling of 638850816 in words is "six hundred thirty-eight million, eight hundred fifty thousand, eight hundred sixteen".