636944 has 60 divisors (see below), whose sum is σ = 1583232. Its totient is φ = 242880.

The previous prime is 636931. The next prime is 636947. The reversal of 636944 is 449636.

It is a self number, because there is not a number n which added to its sum of digits gives 636944.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636944.

It is not an unprimeable number, because it can be changed into a prime (636947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13529 + ... + 13575.

2⁶³⁶⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791616).

636944 is an abundant number, since it is smaller than the sum of its proper divisors (946288).

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

636944 is a wasteful number, since it uses less digits than its factorization.

636944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 67 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 636944 is about 798.0877144776. The cubic root of 636944 is about 86.0400030230.

It can be divided in two parts, 63 and 6944, that added together give a palindrome (7007).

The spelling of 636944 in words is "six hundred thirty-six thousand, nine hundred forty-four".