81068224 has 56 divisors (see below), whose sum is σ = 171907200. Its totient is φ = 37847040.

The previous prime is 81068177. The next prime is 81068227. The reversal of 81068224 is 42286018.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (81068227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56832 + ... + 58240.

Almost surely, 2^81068224 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 81068224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85953600).

81068224 is an abundant number, since it is smaller than the sum of its proper divisors (90838976).

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

81068224 is a wasteful number, since it uses less digits than its factorization.

81068224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481 (or 1471 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 81068224 is about 9003.7894244590. The cubic root of 81068224 is about 432.7963135888.

The spelling of 81068224 in words is "eighty-one million, sixty-eight thousand, two hundred twenty-four".