636825 has 24 divisors (see below), whose sum is σ = 1204288. Its totient is φ = 290880.

The previous prime is 636821. The next prime is 636829. The reversal of 636825 is 528636.

636825 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (636821) and next prime (636829).

It is not a de Polignac number, because 636825 - 2² = 636821 is a prime.

It is a Duffinian number.

636825 is strictly pandigital in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 636792 and 636801.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636825.

It is not an unprimeable number, because it can be changed into a prime (636821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82 + ... + 1131.

2⁶³⁶⁸²⁵ is an apocalyptic number.

It is an amenable number.

636825 is a deficient number, since it is larger than the sum of its proper divisors (567463).

636825 is a wasteful number, since it uses less digits than its factorization.

636825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233 (or 1228 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 636825 is about 798.0131577863. The cubic root of 636825 is about 86.0346444158.

The spelling of 636825 in words is "six hundred thirty-six thousand, eight hundred twenty-five".