636620 has 24 divisors (see below), whose sum is σ = 1352400. Its totient is φ = 251712.

The previous prime is 636619. The next prime is 636631. The reversal of 636620 is 26636.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636620.

It is an unprimeable 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 in 7 ways as a sum of consecutive naturals, for example, 2666 + ... + 2894.

It is an arithmetic number, because the mean of its divisors is an integer number (56350).

2⁶³⁶⁶²⁰ is an apocalyptic number.

It is an amenable number.

636620 is an abundant number, since it is smaller than the sum of its proper divisors (715780).

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

636620 is a wasteful number, since it uses less digits than its factorization.

636620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 636620 is about 797.8847034503. The cubic root of 636620 is about 86.0254116360.

The spelling of 636620 in words is "six hundred thirty-six thousand, six hundred twenty".