81324292 has 24 divisors (see below), whose sum is σ = 164094336. Its totient is φ = 34543488.

The previous prime is 81324289. The next prime is 81324307. The reversal of 81324292 is 29242318.

It is a super-2 number, since 2×81324292² = 13227280938602528, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 9688 + ... + 16015.

It is an arithmetic number, because the mean of its divisors is an integer number (6837264).

Almost surely, 2^81324292 is an apocalyptic number.

It is an amenable number.

81324292 is an abundant number, since it is smaller than the sum of its proper divisors (82770044).

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

81324292 is a wasteful number, since it uses less digits than its factorization.

81324292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25827 (or 25825 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 81324292 is about 9017.9982257705. The cubic root of 81324292 is about 433.2515219650.

The spelling of 81324292 in words is "eighty-one million, three hundred twenty-four thousand, two hundred ninety-two".