636243636 has 36 divisors (see below), whose sum is σ = 1726948608. Its totient is φ = 181783728.

The previous prime is 636243623. The next prime is 636243667. The reversal of 636243636 is 636342636.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 636243594 and 636243603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540436 + ... + 541611.

Almost surely, 2^636243636 is an apocalyptic number.

It is an amenable number.

636243636 is an abundant number, since it is smaller than the sum of its proper divisors (1090704972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636243636 is a wasteful number, since it uses less digits than its factorization.

636243636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082068 (or 1082059 counting only the distinct ones).

The product of its digits is 279936, while the sum is 39.

The square root of 636243636 is about 25223.8703612273. The cubic root of 636243636 is about 860.0845581180.

The spelling of 636243636 in words is "six hundred thirty-six million, two hundred forty-three thousand, six hundred thirty-six".