304721328 has 160 divisors (see below), whose sum is σ = 878515200. Its totient is φ = 90574848.

The previous prime is 304721321. The next prime is 304721353. The reversal of 304721328 is 823127403.

It is a junction number, because it is equal to n+sod(n) for n = 304721295 and 304721304.

It is not an unprimeable number, because it can be changed into a prime (304721321) 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 31 ways as a sum of consecutive naturals, for example, 1869375 + ... + 1869537.

It is an arithmetic number, because the mean of its divisors is an integer number (5490720).

Almost surely, 2^304721328 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 304721328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439257600).

304721328 is an abundant number, since it is smaller than the sum of its proper divisors (573793872).

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

304721328 is a wasteful number, since it uses less digits than its factorization.

304721328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 304721328 is about 17456.2690171755. The cubic root of 304721328 is about 672.9264786070.

The spelling of 304721328 in words is "three hundred four million, seven hundred twenty-one thousand, three hundred twenty-eight".