636680 has 32 divisors (see below), whose sum is σ = 1563840. Its totient is φ = 231360.

The previous prime is 636673. The next prime is 636697. The reversal of 636680 is 86636.

It is a super-2 number, since 2×636680² = 810722844800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

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, 284 + ... + 1163.

It is an arithmetic number, because the mean of its divisors is an integer number (48870).

2⁶³⁶⁶⁸⁰ is an apocalyptic number.

It is an amenable number.

636680 is an abundant number, since it is smaller than the sum of its proper divisors (927160).

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

636680 is a wasteful number, since it uses less digits than its factorization.

636680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 636680 is about 797.9223019818. The cubic root of 636680 is about 86.0281141182.

It can be divided in two parts, 6366 and 80, that added together give a palindrome (6446).

The spelling of 636680 in words is "six hundred thirty-six thousand, six hundred eighty".