636216136 has 16 divisors (see below), whose sum is σ = 1196289900. Its totient is φ = 317205504.

The previous prime is 636216127. The next prime is 636216137. The reversal of 636216136 is 631612636.

It can be written as a sum of positive squares in 2 ways, for example, as 630311236 + 5904900 = 25106^2 + 2430^2 .

It is not an unprimeable number, because it can be changed into a prime (636216137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109821 + ... + 115468.

Almost surely, 2^636216136 is an apocalyptic number.

It is an amenable number.

636216136 is a deficient number, since it is larger than the sum of its proper divisors (560073764).

636216136 is a wasteful number, since it uses less digits than its factorization.

636216136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225648 (or 225644 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The square root of 636216136 is about 25223.3252367724. The cubic root of 636216136 is about 860.0721662895.

The spelling of 636216136 in words is "six hundred thirty-six million, two hundred sixteen thousand, one hundred thirty-six".