636996799 has 8 divisors (see below), whose sum is σ = 671275872. Its totient is φ = 603266400.

The previous prime is 636996761. The next prime is 636996823. The reversal of 636996799 is 997699636.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 636996799 - 2⁹ = 636996287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 636996799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636996719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134784 + ... + 139429.

It is an arithmetic number, because the mean of its divisors is an integer number (83909484).

Almost surely, 2^636996799 is an apocalyptic number.

636996799 is a deficient number, since it is larger than the sum of its proper divisors (34279073).

636996799 is a wasteful number, since it uses less digits than its factorization.

636996799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274337.

The product of its digits is 29760696, while the sum is 64.

The square root of 636996799 is about 25238.7955140494. The cubic root of 636996799 is about 860.4238036467.

The spelling of 636996799 in words is "six hundred thirty-six million, nine hundred ninety-six thousand, seven hundred ninety-nine".