320003240 has 32 divisors (see below), whose sum is σ = 762362280. Its totient is φ = 120471552.

The previous prime is 320003239. The next prime is 320003267. The reversal of 320003240 is 42300023.

It can be written as a sum of positive squares in 4 ways, for example, as 298529284 + 21473956 = 17278^2 + 4634^2 .

It is a super-2 number, since 2×320003240² = 204804147220995200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234617 + ... + 235976.

Almost surely, 2^320003240 is an apocalyptic number.

It is an amenable number.

320003240 is an abundant number, since it is smaller than the sum of its proper divisors (442359040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320003240 is a wasteful number, since it uses less digits than its factorization.

320003240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470621 (or 470617 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 320003240 is about 17888.6343805222. The cubic root of 320003240 is about 683.9926871304.

Adding to 320003240 its reverse (42300023), we get a palindrome (362303263).

The spelling of 320003240 in words is "three hundred twenty million, three thousand, two hundred forty".