81368112 has 80 divisors (see below), whose sum is σ = 250698240. Its totient is φ = 22235136.

The previous prime is 81368047. The next prime is 81368117. The reversal of 81368112 is 21186318.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81368112.

It is not an unprimeable number, because it can be changed into a prime (81368117) 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 15 ways as a sum of consecutive naturals, for example, 2464 + ... + 12992.

It is an arithmetic number, because the mean of its divisors is an integer number (3133728).

Almost surely, 2^81368112 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 81368112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125349120).

81368112 is an abundant number, since it is smaller than the sum of its proper divisors (169330128).

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

81368112 is a wasteful number, since it uses less digits than its factorization.

81368112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570 (or 10564 counting only the distinct ones).

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

The square root of 81368112 is about 9020.4274843269. The cubic root of 81368112 is about 433.3293243548.

The spelling of 81368112 in words is "eighty-one million, three hundred sixty-eight thousand, one hundred twelve".