81395832 has 64 divisors (see below), whose sum is σ = 240076800. Its totient is φ = 22504320.

The previous prime is 81395807. The next prime is 81395849. The reversal of 81395832 is 23859318.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2607 + ... + 13022.

It is an arithmetic number, because the mean of its divisors is an integer number (3751200).

Almost surely, 2^81395832 is an apocalyptic number.

It is an amenable number.

81395832 is an abundant number, since it is smaller than the sum of its proper divisors (158680968).

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

81395832 is a wasteful number, since it uses less digits than its factorization.

81395832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15676 (or 15672 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 81395832 is about 9021.9638660327. The cubic root of 81395832 is about 433.3785267789.

The spelling of 81395832 in words is "eighty-one million, three hundred ninety-five thousand, eight hundred thirty-two".