320730745 has 16 divisors (see below), whose sum is σ = 402319872. Its totient is φ = 244995520.

The previous prime is 320730727. The next prime is 320730769. The reversal of 320730745 is 547037023.

It is not a de Polignac number, because 320730745 - 2⁵ = 320730713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72960 + ... + 77230.

It is an arithmetic number, because the mean of its divisors is an integer number (25144992).

Almost surely, 2^320730745 is an apocalyptic number.

It is an amenable number.

320730745 is a deficient number, since it is larger than the sum of its proper divisors (81589127).

320730745 is a wasteful number, since it uses less digits than its factorization.

320730745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4952.

The product of its (nonzero) digits is 17640, while the sum is 31.

The square root of 320730745 is about 17908.9571164822. The cubic root of 320730745 is about 684.5106313477.

Adding to 320730745 its reverse (547037023), we get a palindrome (867767768).

The spelling of 320730745 in words is "three hundred twenty million, seven hundred thirty thousand, seven hundred forty-five".