811687812 has 48 divisors (see below), whose sum is σ = 2043972672. Its totient is φ = 249217920.

The previous prime is 811687741. The next prime is 811687817. The reversal of 811687812 is 218786118.

It is not an unprimeable number, because it can be changed into a prime (811687817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71298 + ... + 81894.

It is an arithmetic number, because the mean of its divisors is an integer number (42582764).

Almost surely, 2^811687812 is an apocalyptic number.

It is an amenable number.

811687812 is an abundant number, since it is smaller than the sum of its proper divisors (1232284860).

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

811687812 is a wasteful number, since it uses less digits than its factorization.

811687812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11108 (or 11106 counting only the distinct ones).

The product of its digits is 43008, while the sum is 42.

The square root of 811687812 is about 28490.1353454139. The cubic root of 811687812 is about 932.8167623894.

The spelling of 811687812 in words is "eight hundred eleven million, six hundred eighty-seven thousand, eight hundred twelve".