323231220 has 144 divisors (see below), whose sum is σ = 1078721280. Its totient is φ = 77845248.

The previous prime is 323231177. The next prime is 323231221. The reversal of 323231220 is 22132323.

It is a happy number.

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 = 323231193 and 323231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323231221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108511 + ... + 111449.

It is an arithmetic number, because the mean of its divisors is an integer number (7491120).

Almost surely, 2^323231220 is an apocalyptic number.

323231220 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 323231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (539360640).

323231220 is an abundant number, since it is smaller than the sum of its proper divisors (755490060).

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

323231220 is a wasteful number, since it uses less digits than its factorization.

323231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014 (or 3009 counting only the distinct ones).

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

The square root of 323231220 is about 17978.6323172815. The cubic root of 323231220 is about 686.2848848063.

Adding to 323231220 its reverse (22132323), we get a palindrome (345363543).

The spelling of 323231220 in words is "three hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty".