638416475 has 6 divisors (see below), whose sum is σ = 791636460. Its totient is φ = 510733160.

The previous prime is 638416447. The next prime is 638416489. The reversal of 638416475 is 574614836.

It is not a de Polignac number, because 638416475 - 2¹⁰ = 638415451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12768305 + ... + 12768354.

It is an arithmetic number, because the mean of its divisors is an integer number (131939410).

Almost surely, 2^638416475 is an apocalyptic number.

638416475 is a deficient number, since it is larger than the sum of its proper divisors (153219985).

638416475 is a wasteful number, since it uses less digits than its factorization.

638416475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25536669 (or 25536664 counting only the distinct ones).

The product of its digits is 483840, while the sum is 44.

The square root of 638416475 is about 25266.9047372249. The cubic root of 638416475 is about 861.0625387641.

The spelling of 638416475 in words is "six hundred thirty-eight million, four hundred sixteen thousand, four hundred seventy-five".