81944112 has 60 divisors (see below), whose sum is σ = 223464120. Its totient is φ = 25871616.

The previous prime is 81944099. The next prime is 81944113. The reversal of 81944112 is 21144918.

It is a self number, because there is not a number n which added to its sum of digits gives 81944112.

It is not an unprimeable number, because it can be changed into a prime (81944113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14964 + ... + 19692.

It is an arithmetic number, because the mean of its divisors is an integer number (3724402).

Almost surely, 2^81944112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81944112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111732060).

81944112 is an abundant number, since it is smaller than the sum of its proper divisors (141520008).

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

81944112 is a wasteful number, since it uses less digits than its factorization.

81944112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778 (or 4753 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 81944112 is about 9052.2987135865. The cubic root of 81944112 is about 434.3494251768.

The spelling of 81944112 in words is "eighty-one million, nine hundred forty-four thousand, one hundred twelve".