81324594 has 128 divisors (see below), whose sum is σ = 208373760. Its totient is φ = 23328000.

The previous prime is 81324571. The next prime is 81324623. The reversal of 81324594 is 49542318.

It is a super-2 number, since 2×81324594² = 13227379178529672, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 805144 + ... + 805244.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^81324594 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81324594, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104186880).

81324594 is an abundant number, since it is smaller than the sum of its proper divisors (127049166).

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

81324594 is a wasteful number, since it uses less digits than its factorization.

81324594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 187 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 81324594 is about 9018.0149700475. The cubic root of 81324594 is about 433.2520582614.

It can be divided in two parts, 81324 and 594, that added together give a palindrome (81918).

The spelling of 81324594 in words is "eighty-one million, three hundred twenty-four thousand, five hundred ninety-four".