811881888 has 24 divisors (see below), whose sum is σ = 2131190208. Its totient is φ = 270627264.

The previous prime is 811881881. The next prime is 811881893. The reversal of 811881888 is 888188118.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 811881888.

It is not an unprimeable number, because it can be changed into a prime (811881881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4228456 + ... + 4228647.

It is an arithmetic number, because the mean of its divisors is an integer number (88799592).

Almost surely, 2^811881888 is an apocalyptic number.

It is an amenable number.

811881888 is an abundant number, since it is smaller than the sum of its proper divisors (1319308320).

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

811881888 is a wasteful number, since it uses less digits than its factorization.

811881888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8457116 (or 8457108 counting only the distinct ones).

The product of its digits is 262144, while the sum is 51.

The square root of 811881888 is about 28493.5411628671. The cubic root of 811881888 is about 932.8911025140.

The spelling of 811881888 in words is "eight hundred eleven million, eight hundred eighty-one thousand, eight hundred eighty-eight".