320404045 has 16 divisors (see below), whose sum is σ = 414438192. Its totient is φ = 236390400.

The previous prime is 320404039. The next prime is 320404067. The reversal of 320404045 is 540404023.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 63186601 + 257217444 = 7949^2 + 16038^2 .

It is not a de Polignac number, because 320404045 - 2³ = 320404037 is a prime.

It is a Duffinian number.

It is a congruent 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, 122269 + ... + 124861.

It is an arithmetic number, because the mean of its divisors is an integer number (25902387).

Almost surely, 2^320404045 is an apocalyptic number.

It is an amenable number.

320404045 is a deficient number, since it is larger than the sum of its proper divisors (94034147).

320404045 is a wasteful number, since it uses less digits than its factorization.

320404045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 320404045 is about 17899.8336584450. The cubic root of 320404045 is about 684.2781356065.

Subtracting from 320404045 its sum of digits (22), we obtain a palindrome (320404023).

Adding to 320404045 its reverse (540404023), we get a palindrome (860808068).

The spelling of 320404045 in words is "three hundred twenty million, four hundred four thousand, forty-five".