28008517 has 2 divisors, whose sum is σ = 28008518. Its totient is φ = 28008516.

The previous prime is 28008511. The next prime is 28008551. The reversal of 28008517 is 71580082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23677956 + 4330561 = 4866^2 + 2081^2 .

It is a cyclic number.

It is not a de Polignac number, because 28008517 - 2³ = 28008509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28008511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14004258 + 14004259.

It is an arithmetic number, because the mean of its divisors is an integer number (14004259).

Almost surely, 2^28008517 is an apocalyptic number.

It is an amenable number.

28008517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28008517 is an equidigital number, since it uses as much as digits as its factorization.

28008517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 28008517 is about 5292.3073417934. The cubic root of 28008517 is about 303.6896829095.

Adding to 28008517 its reverse (71580082), we get a palindrome (99588599).

The spelling of 28008517 in words is "twenty-eight million, eight thousand, five hundred seventeen".