320323643 has 4 divisors (see below), whose sum is σ = 324183048. Its totient is φ = 316464240.

The previous prime is 320323637. The next prime is 320323657. The reversal of 320323643 is 346323023.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 320323643 - 2²² = 316129339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320323243) 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, 1929578 + ... + 1929743.

It is an arithmetic number, because the mean of its divisors is an integer number (81045762).

Almost surely, 2^320323643 is an apocalyptic number.

320323643 is a deficient number, since it is larger than the sum of its proper divisors (3859405).

320323643 is an equidigital number, since it uses as much as digits as its factorization.

320323643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859404.

The product of its (nonzero) digits is 7776, while the sum is 26.

The square root of 320323643 is about 17897.5876307395. The cubic root of 320323643 is about 684.2208933690.

Adding to 320323643 its reverse (346323023), we get a palindrome (666646666).

The spelling of 320323643 in words is "three hundred twenty million, three hundred twenty-three thousand, six hundred forty-three".