811866879 has 24 divisors (see below), whose sum is σ = 1202947200. Its totient is φ = 527422272.

The previous prime is 811866863. The next prime is 811866889. The reversal of 811866879 is 978668118.

It is not a de Polignac number, because 811866879 - 2⁴ = 811866863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811866859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65362 + ... + 76784.

It is an arithmetic number, because the mean of its divisors is an integer number (50122800).

Almost surely, 2^811866879 is an apocalyptic number.

811866879 is a deficient number, since it is larger than the sum of its proper divisors (391080321).

811866879 is a wasteful number, since it uses less digits than its factorization.

811866879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11631 (or 11628 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 811866879 is about 28493.2777861727. The cubic root of 811866879 is about 932.8853537924.

The spelling of 811866879 in words is "eight hundred eleven million, eight hundred sixty-six thousand, eight hundred seventy-nine".