309028 has 12 divisors (see below), whose sum is σ = 564480. Its totient is φ = 147752.

The previous prime is 309019. The next prime is 309031. The reversal of 309028 is 820903.

309028 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 8.

It is a nialpdrome in base 13.

It is a zygodrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1588 + ... + 1771.

It is an arithmetic number, because the mean of its divisors is an integer number (47040).

2³⁰⁹⁰²⁸ is an apocalyptic number.

It is an amenable number.

309028 is a deficient number, since it is larger than the sum of its proper divisors (255452).

309028 is a wasteful number, since it uses less digits than its factorization.

309028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386 (or 3384 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 309028 is about 555.9028692137. The cubic root of 309028 is about 67.6081849968.

The spelling of 309028 in words is "three hundred nine thousand, twenty-eight".