636836 has 6 divisors (see below), whose sum is σ = 1114470. Its totient is φ = 318416.

The previous prime is 636829. The next prime is 636851. The reversal of 636836 is 638636.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 630436 + 6400 = 794^2 + 80^2 .

It is an Ulam number.

It is an unprimeable number.

636836 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79601 + ... + 79608.

It is an arithmetic number, because the mean of its divisors is an integer number (185745).

2⁶³⁶⁸³⁶ is an apocalyptic number.

It is an amenable number.

636836 is a deficient number, since it is larger than the sum of its proper divisors (477634).

636836 is a wasteful number, since it uses less digits than its factorization.

636836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159213 (or 159211 counting only the distinct ones).

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

The square root of 636836 is about 798.0200498734. The cubic root of 636836 is about 86.0351397772.

Subtracting from 636836 its sum of digits (32), we obtain a square (636804 = 798²).

The spelling of 636836 in words is "six hundred thirty-six thousand, eight hundred thirty-six".