320725145 has 16 divisors (see below), whose sum is σ = 438858000. Its totient is φ = 222910464.

The previous prime is 320725127. The next prime is 320725151. The reversal of 320725145 is 541527023.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4276624 + 316448521 = 2068^2 + 17789^2 .

It is a cyclic number.

It is not a de Polignac number, because 320725145 - 2²⁰ = 319676569 is a prime.

It is a Curzon 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, 144020 + ... + 146229.

It is an arithmetic number, because the mean of its divisors is an integer number (27428625).

Almost surely, 2^320725145 is an apocalyptic number.

It is an amenable number.

320725145 is a deficient number, since it is larger than the sum of its proper divisors (118132855).

320725145 is a wasteful number, since it uses less digits than its factorization.

320725145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290284.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 320725145 is about 17908.8007694541. The cubic root of 320725145 is about 684.5066474433.

The spelling of 320725145 in words is "three hundred twenty million, seven hundred twenty-five thousand, one hundred forty-five".