636736225 has 12 divisors (see below), whose sum is σ = 791906284. Its totient is φ = 507870720.

The previous prime is 636736211. The next prime is 636736229. The reversal of 636736225 is 522637636.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 99980001 + 536756224 = 9999^2 + 23168^2 .

It is not a de Polignac number, because 636736225 - 2¹³ = 636728033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636736229) 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 11 ways as a sum of consecutive naturals, for example, 29364 + ... + 46213.

Almost surely, 2^636736225 is an apocalyptic number.

It is an amenable number.

636736225 is a deficient number, since it is larger than the sum of its proper divisors (155170059).

636736225 is a wasteful number, since it uses less digits than its factorization.

636736225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75924 (or 75919 counting only the distinct ones).

The product of its digits is 272160, while the sum is 40.

The square root of 636736225 is about 25233.6328141629. The cubic root of 636736225 is about 860.3064641504.

The spelling of 636736225 in words is "six hundred thirty-six million, seven hundred thirty-six thousand, two hundred twenty-five".