304428639 has 16 divisors (see below), whose sum is σ = 430133760. Its totient is φ = 190857600.

The previous prime is 304428623. The next prime is 304428643. The reversal of 304428639 is 936824403.

It is not a de Polignac number, because 304428639 - 2⁴ = 304428623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 304428597 and 304428606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304428739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118632 + ... + 121170.

It is an arithmetic number, because the mean of its divisors is an integer number (26883360).

Almost surely, 2^304428639 is an apocalyptic number.

304428639 is a deficient number, since it is larger than the sum of its proper divisors (125705121).

304428639 is a wasteful number, since it uses less digits than its factorization.

304428639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910.

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 304428639 is about 17447.8835106153. The cubic root of 304428639 is about 672.7109578956.

The spelling of 304428639 in words is "three hundred four million, four hundred twenty-eight thousand, six hundred thirty-nine".