320346257 has 16 divisors (see below), whose sum is σ = 406933632. Its totient is φ = 244907520.

The previous prime is 320346253. The next prime is 320346263. The reversal of 320346257 is 752643023.

It is not a de Polignac number, because 320346257 - 2² = 320346253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320346253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35168 + ... + 43329.

It is an arithmetic number, because the mean of its divisors is an integer number (25433352).

Almost surely, 2^320346257 is an apocalyptic number.

It is an amenable number.

320346257 is a deficient number, since it is larger than the sum of its proper divisors (86587375).

320346257 is a wasteful number, since it uses less digits than its factorization.

320346257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78568.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 320346257 is about 17898.2193807094. The cubic root of 320346257 is about 684.2369943839.

The spelling of 320346257 in words is "three hundred twenty million, three hundred forty-six thousand, two hundred fifty-seven".