28094309 has 2 divisors, whose sum is σ = 28094310. Its totient is φ = 28094308.

The previous prime is 28094279. The next prime is 28094323. The reversal of 28094309 is 90349082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28058209 + 36100 = 5297^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 28094309 - 2¹² = 28090213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28094009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14047154 + 14047155.

It is an arithmetic number, because the mean of its divisors is an integer number (14047155).

Almost surely, 2^28094309 is an apocalyptic number.

It is an amenable number.

28094309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28094309 is an equidigital number, since it uses as much as digits as its factorization.

28094309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28094309 is about 5300.4064938455. The cubic root of 28094309 is about 303.9994409327. Note that the first 3 decimals are identical.

The spelling of 28094309 in words is "twenty-eight million, ninety-four thousand, three hundred nine".