638875814 has 32 divisors (see below), whose sum is σ = 994356000. Its totient is φ = 307722240.

The previous prime is 638875813. The next prime is 638875843. The reversal of 638875814 is 418578836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638875813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1422662 + ... + 1423110.

It is an arithmetic number, because the mean of its divisors is an integer number (31073625).

Almost surely, 2^638875814 is an apocalyptic number.

638875814 is a deficient number, since it is larger than the sum of its proper divisors (355480186).

638875814 is a wasteful number, since it uses less digits than its factorization.

638875814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

The product of its digits is 1290240, while the sum is 50.

The square root of 638875814 is about 25275.9928390558. The cubic root of 638875814 is about 861.2690000113.

The spelling of 638875814 in words is "six hundred thirty-eight million, eight hundred seventy-five thousand, eight hundred fourteen".