81613882 has 16 divisors (see below), whose sum is σ = 140025600. Its totient is φ = 34948368.

The previous prime is 81613877. The next prime is 81613901. The reversal of 81613882 is 28831618.

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, 30744 + ... + 33292.

It is an arithmetic number, because the mean of its divisors is an integer number (8751600).

Almost surely, 2^81613882 is an apocalyptic number.

81613882 is a deficient number, since it is larger than the sum of its proper divisors (58411718).

81613882 is a wasteful number, since it uses less digits than its factorization.

81613882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4845.

The product of its digits is 18432, while the sum is 37.

The square root of 81613882 is about 9034.0401814471. The cubic root of 81613882 is about 433.7651720062.

The spelling of 81613882 in words is "eighty-one million, six hundred thirteen thousand, eight hundred eighty-two".