320605720 has 128 divisors (see below), whose sum is σ = 803727360. Its totient is φ = 114554880.

The previous prime is 320605711. The next prime is 320605723. The reversal of 320605720 is 27506023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320605723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1412247 + ... + 1412473.

It is an arithmetic number, because the mean of its divisors is an integer number (6279120).

Almost surely, 2^320605720 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 320605720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401863680).

320605720 is an abundant number, since it is smaller than the sum of its proper divisors (483121640).

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

320605720 is a wasteful number, since it uses less digits than its factorization.

320605720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 320605720 is about 17905.4662044863. The cubic root of 320605720 is about 684.4216760837.

The spelling of 320605720 in words is "three hundred twenty million, six hundred five thousand, seven hundred twenty".