320028321 has 8 divisors (see below), whose sum is σ = 426787200. Its totient is φ = 213310832.

The previous prime is 320028307. The next prime is 320028323. The reversal of 320028321 is 123820023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320028321 - 2¹⁰ = 320027297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320028323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23755 + ... + 34703.

It is an arithmetic number, because the mean of its divisors is an integer number (53348400).

Almost surely, 2^320028321 is an apocalyptic number.

It is an amenable number.

320028321 is a deficient number, since it is larger than the sum of its proper divisors (106758879).

320028321 is a wasteful number, since it uses less digits than its factorization.

320028321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20695.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 320028321 is about 17889.3353984993. The cubic root of 320028321 is about 684.0105565041.

Adding to 320028321 its reverse (123820023), we get a palindrome (443848344).

The spelling of 320028321 in words is "three hundred twenty million, twenty-eight thousand, three hundred twenty-one".