320231312 has 40 divisors (see below), whose sum is σ = 663145056. Its totient is φ = 149275136.

The previous prime is 320231309. The next prime is 320231321. The reversal of 320231312 is 213132023.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 7 ways as a sum of consecutive naturals, for example, 23603 + ... + 34605.

Almost surely, 2^320231312 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 320231312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331572528).

320231312 is an abundant number, since it is smaller than the sum of its proper divisors (342913744).

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

320231312 is a wasteful number, since it uses less digits than its factorization.

320231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11135 (or 11129 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 320231312 is about 17895.0080189979. The cubic root of 320231312 is about 684.1551464580.

Adding to 320231312 its reverse (213132023), we get a palindrome (533363335).

The spelling of 320231312 in words is "three hundred twenty million, two hundred thirty-one thousand, three hundred twelve".