28286717 has 2 divisors, whose sum is σ = 28286718. Its totient is φ = 28286716.

The previous prime is 28286677. The next prime is 28286719. The reversal of 28286717 is 71768282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23174596 + 5112121 = 4814^2 + 2261^2 .

It is a cyclic number.

It is not a de Polignac number, because 28286717 - 2¹⁶ = 28221181 is a prime.

Together with 28286719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28286719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14143358 + 14143359.

It is an arithmetic number, because the mean of its divisors is an integer number (14143359).

Almost surely, 2^28286717 is an apocalyptic number.

It is an amenable number.

28286717 is a deficient number, since it is larger than the sum of its proper divisors (1).

28286717 is an equidigital number, since it uses as much as digits as its factorization.

28286717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 41.

The square root of 28286717 is about 5318.5258295885. The cubic root of 28286717 is about 304.6918575594.

The spelling of 28286717 in words is "twenty-eight million, two hundred eighty-six thousand, seven hundred seventeen".