636144004 has 12 divisors (see below), whose sum is σ = 1113548800. Its totient is φ = 317987208.

The previous prime is 636143957. The next prime is 636144023. The reversal of 636144004 is 400441636.

It is a happy number.

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, 2484 + ... + 35755.

Almost surely, 2^636144004 is an apocalyptic number.

It is an amenable number.

636144004 is a deficient number, since it is larger than the sum of its proper divisors (477404796).

636144004 is a wasteful number, since it uses less digits than its factorization.

636144004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42402 (or 42400 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 636144004 is about 25221.8953292571. The cubic root of 636144004 is about 860.0396610517.

The spelling of 636144004 in words is "six hundred thirty-six million, one hundred forty-four thousand, four".