320732145 has 24 divisors (see below), whose sum is σ = 558119016. Its totient is φ = 170385408.

The previous prime is 320732129. The next prime is 320732219. The reversal of 320732145 is 541237023.

It can be written as a sum of positive squares in 4 ways, for example, as 72386064 + 248346081 = 8508^2 + 15759^2 .

It is not a de Polignac number, because 320732145 - 2⁴ = 320732129 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2302 + ... + 25431.

It is an arithmetic number, because the mean of its divisors is an integer number (23254959).

Almost surely, 2^320732145 is an apocalyptic number.

It is an amenable number.

320732145 is a deficient number, since it is larger than the sum of its proper divisors (237386871).

320732145 is a wasteful number, since it uses less digits than its factorization.

320732145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28001 (or 27998 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 320732145 is about 17908.9962030260. The cubic root of 320732145 is about 684.5116273165.

Adding to 320732145 its reverse (541237023), we get a palindrome (861969168).

The spelling of 320732145 in words is "three hundred twenty million, seven hundred thirty-two thousand, one hundred forty-five".