81933192 has 48 divisors (see below), whose sum is σ = 242077680. Its totient is φ = 24828000.

The previous prime is 81933169. The next prime is 81933197. The reversal of 81933192 is 29133918.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (81933197) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 50934 + ... + 52517.

It is an arithmetic number, because the mean of its divisors is an integer number (5043285).

Almost surely, 2^81933192 is an apocalyptic number.

It is an amenable number.

81933192 is an abundant number, since it is smaller than the sum of its proper divisors (160144488).

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

81933192 is a wasteful number, since it uses less digits than its factorization.

81933192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103474 (or 103467 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 81933192 is about 9051.6955317775. The cubic root of 81933192 is about 434.3301302927.

The spelling of 81933192 in words is "eighty-one million, nine hundred thirty-three thousand, one hundred ninety-two".