638871674 has 32 divisors (see below), whose sum is σ = 1129420800. Its totient is φ = 265310208.

The previous prime is 638871643. The next prime is 638871677. The reversal of 638871674 is 476178836.

It is not an unprimeable number, because it can be changed into a prime (638871677) 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, 130727 + ... + 135525.

It is an arithmetic number, because the mean of its divisors is an integer number (35294400).

Almost surely, 2^638871674 is an apocalyptic number.

638871674 is a deficient number, since it is larger than the sum of its proper divisors (490549126).

638871674 is a wasteful number, since it uses less digits than its factorization.

638871674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102.

The product of its digits is 1354752, while the sum is 50.

The square root of 638871674 is about 25275.9109430303. The cubic root of 638871674 is about 861.2671396281.

The spelling of 638871674 in words is "six hundred thirty-eight million, eight hundred seventy-one thousand, six hundred seventy-four".