304428321 has 16 divisors (see below), whose sum is σ = 462006720. Its totient is φ = 198001440.

The previous prime is 304428287. The next prime is 304428331. The reversal of 304428321 is 123824403.

It is not a de Polignac number, because 304428321 - 2¹¹ = 304426273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (304428331) 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 15 ways as a sum of consecutive naturals, for example, 136395 + ... + 138608.

It is an arithmetic number, because the mean of its divisors is an integer number (28875420).

Almost surely, 2^304428321 is an apocalyptic number.

It is an amenable number.

304428321 is a deficient number, since it is larger than the sum of its proper divisors (157578399).

304428321 is a wasteful number, since it uses less digits than its factorization.

304428321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275053 (or 275047 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 304428321 is about 17447.8743977597. The cubic root of 304428321 is about 672.7107236621.

The spelling of 304428321 in words is "three hundred four million, four hundred twenty-eight thousand, three hundred twenty-one".