81886524 has 12 divisors (see below), whose sum is σ = 191068584. Its totient is φ = 27295504.

The previous prime is 81886499. The next prime is 81886543. The reversal of 81886524 is 42568818.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3411927 + ... + 3411950.

It is an arithmetic number, because the mean of its divisors is an integer number (15922382).

Almost surely, 2^81886524 is an apocalyptic number.

It is an amenable number.

81886524 is an abundant number, since it is smaller than the sum of its proper divisors (109182060).

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

81886524 is a wasteful number, since it uses less digits than its factorization.

81886524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6823884 (or 6823882 counting only the distinct ones).

The product of its digits is 122880, while the sum is 42.

The square root of 81886524 is about 9049.1173050193. The cubic root of 81886524 is about 434.2476518424.

The spelling of 81886524 in words is "eighty-one million, eight hundred eighty-six thousand, five hundred twenty-four".