81324324 has 63 divisors (see below), whose sum is σ = 214664107. Its totient is φ = 26945784.

The previous prime is 81324319. The next prime is 81324403. The reversal of 81324324 is 42342318.

The square root of 81324324 is 9018.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×81324324² = 13227291348113952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 486889 + ... + 487055.

Almost surely, 2^81324324 is an apocalyptic number.

81324324 is the 9018-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81324324

81324324 is an abundant number, since it is smaller than the sum of its proper divisors (133339783).

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

81324324 is an equidigital number, since it uses as much as digits as its factorization.

81324324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 172 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The cubic root of 81324324 is about 433.2515787911.

The spelling of 81324324 in words is "eighty-one million, three hundred twenty-four thousand, three hundred twenty-four".