638674763434 has 8 divisors (see below), whose sum is σ = 958440026880. Its totient is φ = 319194754476.

The previous prime is 638674763423. The next prime is 638674763443. The reversal of 638674763434 is 434367476836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71308024 + ... + 71316979.

It is an arithmetic number, because the mean of its divisors is an integer number (119805003360).

Almost surely, 2^638674763434 is an apocalyptic number.

638674763434 is a deficient number, since it is larger than the sum of its proper divisors (319765263446).

638674763434 is a wasteful number, since it uses less digits than its factorization.

638674763434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142627244.

The product of its digits is 146313216, while the sum is 61.

The spelling of 638674763434 in words is "six hundred thirty-eight billion, six hundred seventy-four million, seven hundred sixty-three thousand, four hundred thirty-four".