81858832 has 20 divisors (see below), whose sum is σ = 173020176. Its totient is φ = 37208480.

The previous prime is 81858823. The next prime is 81858841. The reversal of 81858832 is 23885818.

It is an interprime number because it is at equal distance from previous prime (81858823) and next prime (81858841).

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, 232378 + ... + 232729.

Almost surely, 2^81858832 is an apocalyptic number.

It is an amenable number.

81858832 is an abundant number, since it is smaller than the sum of its proper divisors (91161344).

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

81858832 is a wasteful number, since it uses less digits than its factorization.

81858832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465126 (or 465120 counting only the distinct ones).

The product of its digits is 122880, while the sum is 43.

The square root of 81858832 is about 9047.5870816478. The cubic root of 81858832 is about 434.1986957131.

The spelling of 81858832 in words is "eighty-one million, eight hundred fifty-eight thousand, eight hundred thirty-two".