28005317 has 2 divisors, whose sum is σ = 28005318. Its totient is φ = 28005316.

The previous prime is 28005269. The next prime is 28005331. The reversal of 28005317 is 71350082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26152996 + 1852321 = 5114^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 28005317 - 2¹⁰ = 28004293 is a prime.

It is a Chen prime.

It is equal to p_1741742 and since 28005317 and 1741742 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28005347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14002658 + 14002659.

It is an arithmetic number, because the mean of its divisors is an integer number (14002659).

Almost surely, 2^28005317 is an apocalyptic number.

It is an amenable number.

28005317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28005317 is an equidigital number, since it uses as much as digits as its factorization.

28005317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 28005317 is about 5292.0050075562. The cubic root of 28005317 is about 303.6781168563.

Adding to 28005317 its reverse (71350082), we get a palindrome (99355399).

The spelling of 28005317 in words is "twenty-eight million, five thousand, three hundred seventeen".