81522324 has 72 divisors (see below), whose sum is σ = 227138912. Its totient is φ = 24494400.

The previous prime is 81522323. The next prime is 81522349. The reversal of 81522324 is 42322518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81522323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18099 + ... + 22149.

Almost surely, 2^81522324 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 81522324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113569456).

81522324 is an abundant number, since it is smaller than the sum of its proper divisors (145616588).

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

81522324 is a wasteful number, since it uses less digits than its factorization.

81522324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4117 (or 4112 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 81522324 is about 9028.9713699845. The cubic root of 81522324 is about 433.6029057711.

The spelling of 81522324 in words is "eighty-one million, five hundred twenty-two thousand, three hundred twenty-four".