28247917 has 2 divisors, whose sum is σ = 28247918. Its totient is φ = 28247916.

The previous prime is 28247903. The next prime is 28247953. The reversal of 28247917 is 71974282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18224361 + 10023556 = 4269^2 + 3166^2 .

It is a cyclic number.

It is not a de Polignac number, because 28247917 - 2¹⁵ = 28215149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28247917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28247957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14123958 + 14123959.

It is an arithmetic number, because the mean of its divisors is an integer number (14123959).

Almost surely, 2^28247917 is an apocalyptic number.

It is an amenable number.

28247917 is a deficient number, since it is larger than the sum of its proper divisors (1).

28247917 is an equidigital number, since it uses as much as digits as its factorization.

28247917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 28247917 is about 5314.8769505982. The cubic root of 28247917 is about 304.5524817350.

The spelling of 28247917 in words is "twenty-eight million, two hundred forty-seven thousand, nine hundred seventeen".