28008317 has 2 divisors, whose sum is σ = 28008318. Its totient is φ = 28008316.

The previous prime is 28008307. The next prime is 28008347. The reversal of 28008317 is 71380082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25664356 + 2343961 = 5066^2 + 1531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28008317 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28008317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28008307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14004158 + 14004159.

It is an arithmetic number, because the mean of its divisors is an integer number (14004159).

Almost surely, 2^28008317 is an apocalyptic number.

It is an amenable number.

28008317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28008317 is an equidigital number, since it uses as much as digits as its factorization.

28008317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 28008317 is about 5292.2884464095. The cubic root of 28008317 is about 303.6889600570.

Adding to 28008317 its reverse (71380082), we get a palindrome (99388399).

The spelling of 28008317 in words is "twenty-eight million, eight thousand, three hundred seventeen".