81324 has 30 divisors (see below), whose sum is σ = 213444.
Its totient is φ = 27000.
The previous prime is 81307. The next prime is 81331. The reversal of 81324 is 42318.
It can be divided in two parts, 81 and 324, that multiplied together give a square (26244 = 1622).
It is a happy number.
It is a super-2 number, since 2×813242 = 13227185952, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 81297 and 81306.
It is an unprimeable number.
It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 199 + ... + 449.
281324 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 81324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106722).
81324 is an abundant number, since it is smaller than the sum of its proper divisors (132120).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81324 is a wasteful number, since it uses less digits than its factorization.
81324 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 267 (or 256 counting only the distinct ones).
The product of its digits is 192, while the sum is 18.
The square root of 81324 is about 285.1736313196.
The cubic root of 81324 is about 43.3251003425.
The spelling of 81324 in words is "eighty-one thousand, three hundred twenty-four".