320704768 has 54 divisors (see below), whose sum is σ = 653917502. Its totient is φ = 156948480.

The previous prime is 320704763. The next prime is 320704837. The reversal of 320704768 is 867407023.

It can be written as a sum of positive squares in only one way, i.e., 281165824 + 39538944 = 16768^2 + 6288^2 .

It is not an unprimeable number, because it can be changed into a prime (320704763) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2448063 + ... + 2448193.

Almost surely, 2^320704768 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 320704768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326958751).

320704768 is an abundant number, since it is smaller than the sum of its proper divisors (333212734).

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

320704768 is an frugal number, since it uses more digits than its factorization.

320704768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 320704768 is about 17908.2318501855. The cubic root of 320704768 is about 684.4921506199.

The spelling of 320704768 in words is "three hundred twenty million, seven hundred four thousand, seven hundred sixty-eight".