81623112 has 16 divisors (see below), whose sum is σ = 204057840. Its totient is φ = 27207696.

The previous prime is 81623111. The next prime is 81623117. The reversal of 81623112 is 21132618.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 3400963 = 81623112 / (8 + 1 + 6 + 2 + 3 + 1 + 1 + 2).

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 (81623111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1700458 + ... + 1700505.

It is an arithmetic number, because the mean of its divisors is an integer number (12753615).

Almost surely, 2^81623112 is an apocalyptic number.

It is an amenable number.

81623112 is an abundant number, since it is smaller than the sum of its proper divisors (122434728).

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

81623112 is a wasteful number, since it uses less digits than its factorization.

81623112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400972 (or 3400968 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 81623112 is about 9034.5510126403. The cubic root of 81623112 is about 433.7815233978.

The spelling of 81623112 in words is "eighty-one million, six hundred twenty-three thousand, one hundred twelve".