638953674 has 32 divisors (see below), whose sum is σ = 1309905216. Its totient is φ = 207715200.

The previous prime is 638953669. The next prime is 638953681. The reversal of 638953674 is 476359836.

It is a Curzon number.

It is an unprimeable number.

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, 32734 + ... + 48470.

It is an arithmetic number, because the mean of its divisors is an integer number (40934538).

Almost surely, 2^638953674 is an apocalyptic number.

638953674 is an abundant number, since it is smaller than the sum of its proper divisors (670951542).

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

638953674 is a wasteful number, since it uses less digits than its factorization.

638953674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15910.

The product of its digits is 3265920, while the sum is 51.

The square root of 638953674 is about 25277.5329888025. The cubic root of 638953674 is about 861.3039862996.

The spelling of 638953674 in words is "six hundred thirty-eight million, nine hundred fifty-three thousand, six hundred seventy-four".