636430225 has 12 divisors (see below), whose sum is σ = 790218396. Its totient is φ = 508470080.

The previous prime is 636430211. The next prime is 636430237. The reversal of 636430225 is 522034636.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 255712081 + 380718144 = 15991^2 + 19512^2 .

It is not a de Polignac number, because 636430225 - 2⁷ = 636430097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2859 + ... + 35791.

It is an arithmetic number, because the mean of its divisors is an integer number (65851533).

Almost surely, 2^636430225 is an apocalyptic number.

It is an amenable number.

636430225 is a deficient number, since it is larger than the sum of its proper divisors (153788171).

636430225 is a wasteful number, since it uses less digits than its factorization.

636430225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33716 (or 33711 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 636430225 is about 25227.5687492870. The cubic root of 636430225 is about 860.1686279214.

The spelling of 636430225 in words is "six hundred thirty-six million, four hundred thirty thousand, two hundred twenty-five".