323221320 has 128 divisors (see below), whose sum is σ = 1087862400. Its totient is φ = 85356288.

The previous prime is 323221309. The next prime is 323221321. The reversal of 323221320 is 23122323.

It is a happy number.

323221320 is a `hidden beast` number, since 323 + 2 + 21 + 320 = 666.

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 = 323221293 and 323221302.

It is not an unprimeable number, because it can be changed into a prime (323221321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114162 + ... + 116958.

It is an arithmetic number, because the mean of its divisors is an integer number (8498925).

Almost surely, 2^323221320 is an apocalyptic number.

323221320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 323221320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543931200).

323221320 is an abundant number, since it is smaller than the sum of its proper divisors (764641080).

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

323221320 is a wasteful number, since it uses less digits than its factorization.

323221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924 (or 2914 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 323221320 is about 17978.3569883346. The cubic root of 323221320 is about 686.2778781711.

Adding to 323221320 its reverse (23122323), we get a palindrome (346343643).

The spelling of 323221320 in words is "three hundred twenty-three million, two hundred twenty-one thousand, three hundred twenty".