81886884 has 24 divisors (see below), whose sum is σ = 201126240. Its totient is φ = 25858944.

The previous prime is 81886879. The next prime is 81886913. The reversal of 81886884 is 48868818.

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, 179349 + ... + 179804.

It is an arithmetic number, because the mean of its divisors is an integer number (8380260).

Almost surely, 2^81886884 is an apocalyptic number.

It is an amenable number.

81886884 is an abundant number, since it is smaller than the sum of its proper divisors (119239356).

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

81886884 is a wasteful number, since it uses less digits than its factorization.

81886884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359179 (or 359177 counting only the distinct ones).

The product of its digits is 786432, while the sum is 51.

The square root of 81886884 is about 9049.1371964403. The cubic root of 81886884 is about 434.2482882065.

The spelling of 81886884 in words is "eighty-one million, eight hundred eighty-six thousand, eight hundred eighty-four".