28093517 has 2 divisors, whose sum is σ = 28093518. Its totient is φ = 28093516.

The previous prime is 28093477. The next prime is 28093519. The reversal of 28093517 is 71539082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28026436 + 67081 = 5294^2 + 259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28093517 is a prime.

Together with 28093519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28093519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14046758 + 14046759.

It is an arithmetic number, because the mean of its divisors is an integer number (14046759).

Almost surely, 2^28093517 is an apocalyptic number.

It is an amenable number.

28093517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28093517 is an equidigital number, since it uses as much as digits as its factorization.

28093517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28093517 is about 5300.3317820680. The cubic root of 28093517 is about 303.9965842472.

The spelling of 28093517 in words is "twenty-eight million, ninety-three thousand, five hundred seventeen".