636129996 has 24 divisors (see below), whose sum is σ = 1492887984. Its totient is φ = 210816960.

The previous prime is 636129983. The next prime is 636130043. The reversal of 636129996 is 699921636.

It is a happy number.

636129996 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×636129996² = 809322743621920032, which contains 22 as substring.

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, 151135 + ... + 155286.

It is an arithmetic number, because the mean of its divisors is an integer number (62203666).

Almost surely, 2^636129996 is an apocalyptic number.

It is an amenable number.

636129996 is an abundant number, since it is smaller than the sum of its proper divisors (856757988).

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

636129996 is a wasteful number, since it uses less digits than its factorization.

636129996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306601 (or 306599 counting only the distinct ones).

The product of its digits is 944784, while the sum is 51.

The square root of 636129996 is about 25221.6176324993. The cubic root of 636129996 is about 860.0333482652.

The spelling of 636129996 in words is "six hundred thirty-six million, one hundred twenty-nine thousand, nine hundred ninety-six".