636242907 has 6 divisors (see below), whose sum is σ = 848382132. Its totient is φ = 424132812.

The previous prime is 636242903. The next prime is 636242909. The reversal of 636242907 is 709242636.

It is not a de Polignac number, because 636242907 - 2² = 636242903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636242903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36408 + ... + 50970.

It is an arithmetic number, because the mean of its divisors is an integer number (141397022).

Almost surely, 2^636242907 is an apocalyptic number.

636242907 is a deficient number, since it is larger than the sum of its proper divisors (212139225).

636242907 is an frugal number, since it uses more digits than its factorization.

636242907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29129 (or 14566 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 636242907 is about 25223.8559106256. The cubic root of 636242907 is about 860.0842296265.

The spelling of 636242907 in words is "six hundred thirty-six million, two hundred forty-two thousand, nine hundred seven".