28079209 has 2 divisors, whose sum is σ = 28079210. Its totient is φ = 28079208.

The previous prime is 28079203. The next prime is 28079237. The reversal of 28079209 is 90297082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26491609 + 1587600 = 5147^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 28079209 - 2³ = 28079201 is a prime.

It is not a weakly prime, because it can be changed into another prime (28079201) 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, 14039604 + 14039605.

It is an arithmetic number, because the mean of its divisors is an integer number (14039605).

Almost surely, 2^28079209 is an apocalyptic number.

It is an amenable number.

28079209 is a deficient number, since it is larger than the sum of its proper divisors (1).

28079209 is an equidigital number, since it uses as much as digits as its factorization.

28079209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 28079209 is about 5298.9818833433. The cubic root of 28079209 is about 303.9449670983.

The spelling of 28079209 in words is "twenty-eight million, seventy-nine thousand, two hundred nine".