28209329 has 2 divisors, whose sum is σ = 28209330. Its totient is φ = 28209328.

The previous prime is 28209301. The next prime is 28209343. The reversal of 28209329 is 92390282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18722929 + 9486400 = 4327^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 28209329 - 2¹⁶ = 28143793 is a prime.

It is not a weakly prime, because it can be changed into another prime (28209359) 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, 14104664 + 14104665.

It is an arithmetic number, because the mean of its divisors is an integer number (14104665).

Almost surely, 2^28209329 is an apocalyptic number.

It is an amenable number.

28209329 is a deficient number, since it is larger than the sum of its proper divisors (1).

28209329 is an equidigital number, since it uses as much as digits as its factorization.

28209329 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 28209329 is about 5311.2455224740. The cubic root of 28209329 is about 304.4137408085.

The spelling of 28209329 in words is "twenty-eight million, two hundred nine thousand, three hundred twenty-nine".