813884772 has 12 divisors (see below), whose sum is σ = 1899064496. Its totient is φ = 271294920.

The previous prime is 813884767. The next prime is 813884777. The reversal of 813884772 is 277488318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (813884767) and next prime (813884777).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (813884777) 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, 33911854 + ... + 33911877.

Almost surely, 2^813884772 is an apocalyptic number.

It is an amenable number.

813884772 is an abundant number, since it is smaller than the sum of its proper divisors (1085179724).

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

813884772 is a wasteful number, since it uses less digits than its factorization.

813884772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67823738 (or 67823736 counting only the distinct ones).

The product of its digits is 602112, while the sum is 48.

The square root of 813884772 is about 28528.6657942498. The cubic root of 813884772 is about 933.6576090332.

The spelling of 813884772 in words is "eight hundred thirteen million, eight hundred eighty-four thousand, seven hundred seventy-two".