813235476636 has 72 divisors (see below), whose sum is σ = 2325616185984. Its totient is φ = 246434989680.

The previous prime is 813235476611. The next prime is 813235476689. The reversal of 813235476636 is 636674532318.

813235476636 is a `hidden beast` number, since 8 + 1 + 3 + 2 + 3 + 547 + 66 + 36 = 666.

813235476636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×813235476636² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38019400 + ... + 38040783.

Almost surely, 2^813235476636 is an apocalyptic number.

It is an amenable number.

813235476636 is an abundant number, since it is smaller than the sum of its proper divisors (1512380709348).

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

813235476636 is a wasteful number, since it uses less digits than its factorization.

813235476636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76060213 (or 76060199 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The spelling of 813235476636 in words is "eight hundred thirteen billion, two hundred thirty-five million, four hundred seventy-six thousand, six hundred thirty-six".