28339309 has 2 divisors, whose sum is σ = 28339310. Its totient is φ = 28339308.

The previous prime is 28339307. The next prime is 28339313. The reversal of 28339309 is 90393382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28323684 + 15625 = 5322^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 28339309 - 2¹ = 28339307 is a prime.

Together with 28339307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28339307) 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 as a sum of consecutive naturals, namely, 14169654 + 14169655.

It is an arithmetic number, because the mean of its divisors is an integer number (14169655).

Almost surely, 2^28339309 is an apocalyptic number.

It is an amenable number.

28339309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28339309 is an equidigital number, since it uses as much as digits as its factorization.

28339309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 28339309 is about 5323.4677607740. The cubic root of 28339309 is about 304.8805731480.

The spelling of 28339309 in words is "twenty-eight million, three hundred thirty-nine thousand, three hundred nine".