638056317 has 16 divisors (see below), whose sum is σ = 908379648. Its totient is φ = 397412400.

The previous prime is 638056283. The next prime is 638056333. The reversal of 638056317 is 713650836.

It is not a de Polignac number, because 638056317 - 2⁶ = 638056253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638056337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104559 + ... + 110492.

It is an arithmetic number, because the mean of its divisors is an integer number (56773728).

Almost surely, 2^638056317 is an apocalyptic number.

It is an amenable number.

638056317 is a deficient number, since it is larger than the sum of its proper divisors (270323331).

638056317 is a wasteful number, since it uses less digits than its factorization.

638056317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215120.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 638056317 is about 25259.7766617205. The cubic root of 638056317 is about 860.9005875879.

The spelling of 638056317 in words is "six hundred thirty-eight million, fifty-six thousand, three hundred seventeen".