636684 has 24 divisors (see below), whose sum is σ = 1573488. Its totient is φ = 199680.

The previous prime is 636673. The next prime is 636697. The reversal of 636684 is 486636.

636684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1357 + ... + 1764.

It is an arithmetic number, because the mean of its divisors is an integer number (65562).

2⁶³⁶⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

636684 is an abundant number, since it is smaller than the sum of its proper divisors (936804).

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

636684 is a wasteful number, since it uses less digits than its factorization.

636684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145 (or 3143 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 636684 is about 797.9248084876. The cubic root of 636684 is about 86.0282942776.

The spelling of 636684 in words is "six hundred thirty-six thousand, six hundred eighty-four".