28105717 has 2 divisors, whose sum is σ = 28105718. Its totient is φ = 28105716.

The previous prime is 28105711. The next prime is 28105723. The reversal of 28105717 is 71750182.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (28105711) and next prime (28105723).

It can be written as a sum of positive squares in only one way, i.e., 17089956 + 11015761 = 4134^2 + 3319^2 .

It is a cyclic number.

It is not a de Polignac number, because 28105717 - 2⁷ = 28105589 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 (28105711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14052858 + 14052859.

It is an arithmetic number, because the mean of its divisors is an integer number (14052859).

Almost surely, 2^28105717 is an apocalyptic number.

It is an amenable number.

28105717 is a deficient number, since it is larger than the sum of its proper divisors (1).

28105717 is an equidigital number, since it uses as much as digits as its factorization.

28105717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 28105717 is about 5301.4825285009. The cubic root of 28105717 is about 304.0405827920.

Adding to 28105717 its reverse (71750182), we get a palindrome (99855899).

The spelling of 28105717 in words is "twenty-eight million, one hundred five thousand, seven hundred seventeen".