636541625 has 32 divisors (see below), whose sum is σ = 853182720. Its totient is φ = 472416000.

The previous prime is 636541603. The next prime is 636541627. The reversal of 636541625 is 526145636.

It is a happy number.

It is not a de Polignac number, because 636541625 - 2²⁰ = 635493049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636541627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148766 + ... + 152984.

It is an arithmetic number, because the mean of its divisors is an integer number (26661960).

Almost surely, 2^636541625 is an apocalyptic number.

It is an amenable number.

636541625 is a deficient number, since it is larger than the sum of its proper divisors (216641095).

636541625 is a wasteful number, since it uses less digits than its factorization.

636541625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322 (or 4312 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 636541625 is about 25229.7765546982. The cubic root of 636541625 is about 860.2188126293.

The spelling of 636541625 in words is "six hundred thirty-six million, five hundred forty-one thousand, six hundred twenty-five".