81986024 has 16 divisors (see below), whose sum is σ = 156019200. Its totient is φ = 40380912.

The previous prime is 81986011. The next prime is 81986059. The reversal of 81986024 is 42068918.

It is an unprimeable number.

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, 75944 + ... + 77015.

It is an arithmetic number, because the mean of its divisors is an integer number (9751200).

Almost surely, 2^81986024 is an apocalyptic number.

It is an amenable number.

81986024 is a deficient number, since it is larger than the sum of its proper divisors (74033176).

81986024 is a wasteful number, since it uses less digits than its factorization.

81986024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153032 (or 153028 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 81986024 is about 9054.6134097486. The cubic root of 81986024 is about 434.4234648683.

The spelling of 81986024 in words is "eighty-one million, nine hundred eighty-six thousand, twenty-four".