636412866 has 16 divisors (see below), whose sum is σ = 1339816800. Its totient is φ = 200972448.

The previous prime is 636412849. The next prime is 636412871. The reversal of 636412866 is 668214636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2791171 + ... + 2791398.

It is an arithmetic number, because the mean of its divisors is an integer number (83738550).

Almost surely, 2^636412866 is an apocalyptic number.

636412866 is an abundant number, since it is smaller than the sum of its proper divisors (703403934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636412866 is a wasteful number, since it uses less digits than its factorization.

636412866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582593.

The product of its digits is 248832, while the sum is 42.

The square root of 636412866 is about 25227.2246987258. The cubic root of 636412866 is about 860.1608073191.

The spelling of 636412866 in words is "six hundred thirty-six million, four hundred twelve thousand, eight hundred sixty-six".