8631999636 has 48 divisors (see below), whose sum is σ = 22633747584. Its totient is φ = 2540520576.

The previous prime is 8631999583. The next prime is 8631999641. The reversal of 8631999636 is 6369991368.

It is a super-2 number, since 2×8631999636² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8631999636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199311 + ... + 1206486.

It is an arithmetic number, because the mean of its divisors is an integer number (471536408).

Almost surely, 2^8631999636 is an apocalyptic number.

It is an amenable number.

8631999636 is an abundant number, since it is smaller than the sum of its proper divisors (14001747948).

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

8631999636 is a wasteful number, since it uses less digits than its factorization.

8631999636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405840 (or 2405838 counting only the distinct ones).

The product of its digits is 11337408, while the sum is 60.

The square root of 8631999636 is about 92908.5552357801. Note that the first 3 decimals coincide. The cubic root of 8631999636 is about 2051.3375871822.

The spelling of 8631999636 in words is "eight billion, six hundred thirty-one million, nine hundred ninety-nine thousand, six hundred thirty-six".