636875 has 10 divisors (see below), whose sum is σ = 796620. Its totient is φ = 509000.

The previous prime is 636863. The next prime is 636877. The reversal of 636875 is 578636.

It is a happy number.

It is not a de Polignac number, because 636875 - 2⁸ = 636619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 116 + ... + 1134.

It is an arithmetic number, because the mean of its divisors is an integer number (79662).

2⁶³⁶⁸⁷⁵ is an apocalyptic number.

636875 is a deficient number, since it is larger than the sum of its proper divisors (159745).

636875 is an equidigital number, since it uses as much as digits as its factorization.

636875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039 (or 1024 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 636875 is about 798.0444849756. The cubic root of 636875 is about 86.0368960127.

The spelling of 636875 in words is "six hundred thirty-six thousand, eight hundred seventy-five".