320453728 has 36 divisors (see below), whose sum is σ = 733899852. Its totient is φ = 137336640.

The previous prime is 320453717. The next prime is 320453729. The reversal of 320453728 is 827354023.

It is a junction number, because it is equal to n+sod(n) for n = 320453693 and 320453702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320453729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100618 + ... + 103753.

It is an arithmetic number, because the mean of its divisors is an integer number (20386107).

Almost surely, 2^320453728 is an apocalyptic number.

It is an amenable number.

320453728 is an abundant number, since it is smaller than the sum of its proper divisors (413446124).

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

320453728 is a wasteful number, since it uses less digits than its factorization.

320453728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204395 (or 204380 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 320453728 is about 17901.2214108423. The cubic root of 320453728 is about 684.3135026522.

The spelling of 320453728 in words is "three hundred twenty million, four hundred fifty-three thousand, seven hundred twenty-eight".