320513004 has 96 divisors (see below), whose sum is σ = 991011840. Its totient is φ = 87588864.

The previous prime is 320513003. The next prime is 320513021. The reversal of 320513004 is 400315023.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (320513003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8172 + ... + 26604.

It is an arithmetic number, because the mean of its divisors is an integer number (10323040).

Almost surely, 2^320513004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320513004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495505920).

320513004 is an abundant number, since it is smaller than the sum of its proper divisors (670498836).

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

320513004 is a wasteful number, since it uses less digits than its factorization.

320513004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18476 (or 18468 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 320513004 is about 17902.8769755031. The cubic root of 320513004 is about 684.3556937320.

Adding to 320513004 its reverse (400315023), we get a palindrome (720828027).

The spelling of 320513004 in words is "three hundred twenty million, five hundred thirteen thousand, four".