813328636 has 12 divisors (see below), whose sum is σ = 1439318160. Its totient is φ = 402094880.

The previous prime is 813328631. The next prime is 813328657. The reversal of 813328636 is 636823318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813328631) 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, 1141960 + ... + 1142671.

It is an arithmetic number, because the mean of its divisors is an integer number (119943180).

Almost surely, 2^813328636 is an apocalyptic number.

It is an amenable number.

813328636 is a deficient number, since it is larger than the sum of its proper divisors (625989524).

813328636 is a wasteful number, since it uses less digits than its factorization.

813328636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284724 (or 2284722 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 813328636 is about 28518.9171603692. The cubic root of 813328636 is about 933.4449012321. Note that the first 3 decimals are identical.

The spelling of 813328636 in words is "eight hundred thirteen million, three hundred twenty-eight thousand, six hundred thirty-six".