636884 has 12 divisors (see below), whose sum is σ = 1127700. Its totient is φ = 314688.

The previous prime is 636877. The next prime is 636917. The reversal of 636884 is 488636.

It can be written as a sum of positive squares in 2 ways, for example, as 386884 + 250000 = 622^2 + 500^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539 + ... + 1250.

It is an arithmetic number, because the mean of its divisors is an integer number (93975).

2⁶³⁶⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

636884 is a deficient number, since it is larger than the sum of its proper divisors (490816).

636884 is a wasteful number, since it uses less digits than its factorization.

636884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882 (or 1880 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 636884 is about 798.0501237391. The cubic root of 636884 is about 86.0373012877.

The spelling of 636884 in words is "six hundred thirty-six thousand, eight hundred eighty-four".