636406475 has 24 divisors (see below), whose sum is σ = 858168288. Its totient is φ = 466214400.

The previous prime is 636406417. The next prime is 636406487. The reversal of 636406475 is 574604636.

It is not a de Polignac number, because 636406475 - 2⁸ = 636406219 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4511 + ... + 35960.

It is an arithmetic number, because the mean of its divisors is an integer number (35757012).

Almost surely, 2^636406475 is an apocalyptic number.

636406475 is a deficient number, since it is larger than the sum of its proper divisors (221761813).

636406475 is a wasteful number, since it uses less digits than its factorization.

636406475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40535 (or 40530 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 636406475 is about 25227.0980296981. The cubic root of 636406475 is about 860.1579280006.

The spelling of 636406475 in words is "six hundred thirty-six million, four hundred six thousand, four hundred seventy-five".