636242736860 has 48 divisors (see below), whose sum is σ = 1338737180256. Its totient is φ = 253996925952.

The previous prime is 636242736841. The next prime is 636242736863. The reversal of 636242736860 is 68637242636.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636242736863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44947544 + ... + 44961696.

It is an arithmetic number, because the mean of its divisors is an integer number (27890357922).

Almost surely, 2^636242736860 is an apocalyptic number.

It is an amenable number.

636242736860 is an abundant number, since it is smaller than the sum of its proper divisors (702494443396).

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

636242736860 is a wasteful number, since it uses less digits than its factorization.

636242736860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18422 (or 18420 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 53.

The spelling of 636242736860 in words is "six hundred thirty-six billion, two hundred forty-two million, seven hundred thirty-six thousand, eight hundred sixty".