636804 has 81 divisors (see below), whose sum is σ = 1976247. Its totient is φ = 172368.

The previous prime is 636781. The next prime is 636809. The reversal of 636804 is 408636.

The square root of 636804 is 798.

It is a perfect power (a square), and thus also a powerful number.

636804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (636809) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 33507 + ... + 33525.

636804 is a Friedman number, since it can be written as (804-6)^(6/3), using all its digits and the basic arithmetic operations.

2⁶³⁶⁸⁰⁴ is an apocalyptic number.

636804 is the 798-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636804

636804 is an abundant number, since it is smaller than the sum of its proper divisors (1339443).

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

636804 is a wasteful number, since it uses less digits than its factorization.

636804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The cubic root of 636804 is about 86.0336987099.

The spelling of 636804 in words is "six hundred thirty-six thousand, eight hundred four".