811997892 has 24 divisors (see below), whose sum is σ = 2105180000. Its totient is φ = 270665928.

The previous prime is 811997887. The next prime is 811997903. The reversal of 811997892 is 298799118.

It is a super-2 number, since 2×811997892² = 1318681153224887328, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3759142 + ... + 3759357.

Almost surely, 2^811997892 is an apocalyptic number.

It is an amenable number.

811997892 is an abundant number, since it is smaller than the sum of its proper divisors (1293182108).

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

811997892 is a wasteful number, since it uses less digits than its factorization.

811997892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7518512 (or 7518504 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 811997892 is about 28495.5767093772. The cubic root of 811997892 is about 932.9355317786.

The spelling of 811997892 in words is "eight hundred eleven million, nine hundred ninety-seven thousand, eight hundred ninety-two".