81124368 has 80 divisors (see below), whose sum is σ = 233526720. Its totient is φ = 24095232.

The previous prime is 81124361. The next prime is 81124369. The reversal of 81124368 is 86342118.

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 (81124361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15855 + ... + 20337.

It is an arithmetic number, because the mean of its divisors is an integer number (2919084).

Almost surely, 2^81124368 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 81124368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116763360).

81124368 is an abundant number, since it is smaller than the sum of its proper divisors (152402352).

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

81124368 is a wasteful number, since it uses less digits than its factorization.

81124368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536 (or 4530 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 81124368 is about 9006.9066832071. The cubic root of 81124368 is about 432.8962019205.

The spelling of 81124368 in words is "eighty-one million, one hundred twenty-four thousand, three hundred sixty-eight".