320432144 has 20 divisors (see below), whose sum is σ = 621116496. Its totient is φ = 160144032.

The previous prime is 320432111. The next prime is 320432149. The reversal of 320432144 is 441234023.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (320432149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61547 + ... + 66549.

Almost surely, 2^320432144 is an apocalyptic number.

It is an amenable number.

320432144 is a deficient number, since it is larger than the sum of its proper divisors (300684352).

320432144 is a wasteful number, since it uses less digits than its factorization.

320432144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9014 (or 9008 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 320432144 is about 17900.6185367992. The cubic root of 320432144 is about 684.2981384431.

Adding to 320432144 its reverse (441234023), we get a palindrome (761666167).

The spelling of 320432144 in words is "three hundred twenty million, four hundred thirty-two thousand, one hundred forty-four".