636985338 has 32 divisors (see below), whose sum is σ = 1402790400. Its totient is φ = 191219760.

The previous prime is 636985333. The next prime is 636985339. The reversal of 636985338 is 833589636.

It is not an unprimeable number, because it can be changed into a prime (636985333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38038 + ... + 52161.

It is an arithmetic number, because the mean of its divisors is an integer number (43837200).

Almost surely, 2^636985338 is an apocalyptic number.

636985338 is an abundant number, since it is smaller than the sum of its proper divisors (765805062).

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

636985338 is a wasteful number, since it uses less digits than its factorization.

636985338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90322.

The product of its digits is 2799360, while the sum is 51.

The square root of 636985338 is about 25238.5684617809. The cubic root of 636985338 is about 860.4186432982.

The spelling of 636985338 in words is "six hundred thirty-six million, nine hundred eighty-five thousand, three hundred thirty-eight".