636764 has 6 divisors (see below), whose sum is σ = 1114344. Its totient is φ = 318380.

The previous prime is 636763. The next prime is 636773. The reversal of 636764 is 467636.

It is a self number, because there is not a number n which added to its sum of digits gives 636764.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636764.

It is not an unprimeable number, because it can be changed into a prime (636761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79592 + ... + 79599.

It is an arithmetic number, because the mean of its divisors is an integer number (185724).

2⁶³⁶⁷⁶⁴ is an apocalyptic number.

It is an amenable number.

636764 is a deficient number, since it is larger than the sum of its proper divisors (477580).

636764 is a wasteful number, since it uses less digits than its factorization.

636764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159195 (or 159193 counting only the distinct ones).

The product of its digits is 18144, while the sum is 32.

The square root of 636764 is about 797.9749369498. The cubic root of 636764 is about 86.0318973079.

The spelling of 636764 in words is "six hundred thirty-six thousand, seven hundred sixty-four".