638715316 has 12 divisors (see below), whose sum is σ = 1131901120. Its totient is φ = 315315000.

The previous prime is 638715299. The next prime is 638715331. The reversal of 638715316 is 613517836.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010310 + ... + 1010941.

Almost surely, 2^638715316 is an apocalyptic number.

It is an amenable number.

638715316 is a deficient number, since it is larger than the sum of its proper divisors (493185804).

638715316 is a wasteful number, since it uses less digits than its factorization.

638715316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021334 (or 2021332 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 638715316 is about 25272.8177297269. The cubic root of 638715316 is about 861.1968714765.

The spelling of 638715316 in words is "six hundred thirty-eight million, seven hundred fifteen thousand, three hundred sixteen".