320732256 has 144 divisors (see below), whose sum is σ = 931358736. Its totient is φ = 96565248.

The previous prime is 320732249. The next prime is 320732261. The reversal of 320732256 is 652237023.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 859686 + ... + 860058.

It is an arithmetic number, because the mean of its divisors is an integer number (6467769).

Almost surely, 2^320732256 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 320732256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (465679368).

320732256 is an abundant number, since it is smaller than the sum of its proper divisors (610626480).

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

320732256 is a wasteful number, since it uses less digits than its factorization.

320732256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 30.

The square root of 320732256 is about 17908.9993020269. Note that the first 3 decimals coincide. The cubic root of 320732256 is about 684.5117062825.

Adding to 320732256 its reverse (652237023), we get a palindrome (972969279).

The spelling of 320732256 in words is "three hundred twenty million, seven hundred thirty-two thousand, two hundred fifty-six".