636224164 has 24 divisors (see below), whose sum is σ = 1133175960. Its totient is φ = 312508416.

The previous prime is 636224143. The next prime is 636224219. The reversal of 636224164 is 461422636.

It can be written as a sum of positive squares in 4 ways, for example, as 17707264 + 618516900 = 4208^2 + 24870^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47172 + ... + 59140.

It is an arithmetic number, because the mean of its divisors is an integer number (47215665).

Almost surely, 2^636224164 is an apocalyptic number.

It is an amenable number.

636224164 is a deficient number, since it is larger than the sum of its proper divisors (496951796).

636224164 is a wasteful number, since it uses less digits than its factorization.

636224164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12207 (or 12205 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 636224164 is about 25223.4843746854. The cubic root of 636224164 is about 860.0757838391.

The spelling of 636224164 in words is "six hundred thirty-six million, two hundred twenty-four thousand, one hundred sixty-four".