81369324 has 72 divisors (see below), whose sum is σ = 217766640. Its totient is φ = 25546752.

The previous prime is 81369313. The next prime is 81369329. The reversal of 81369324 is 42396318.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81369329) 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, 230332 + ... + 230684.

Almost surely, 2^81369324 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 81369324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108883320).

81369324 is an abundant number, since it is smaller than the sum of its proper divisors (136397316).

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

81369324 is a wasteful number, since it uses less digits than its factorization.

81369324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 714 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 81369324 is about 9020.4946649283. The cubic root of 81369324 is about 433.3314758632.

The spelling of 81369324 in words is "eighty-one million, three hundred sixty-nine thousand, three hundred twenty-four".