28027817 has 2 divisors, whose sum is σ = 28027818. Its totient is φ = 28027816.

The previous prime is 28027807. The next prime is 28027819. The reversal of 28027817 is 71872082.

28027817 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22477081 + 5550736 = 4741^2 + 2356^2 .

It is a cyclic number.

It is not a de Polignac number, because 28027817 - 2⁴ = 28027801 is a prime.

Together with 28027819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28027819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14013908 + 14013909.

It is an arithmetic number, because the mean of its divisors is an integer number (14013909).

Almost surely, 2^28027817 is an apocalyptic number.

It is an amenable number.

28027817 is a deficient number, since it is larger than the sum of its proper divisors (1).

28027817 is an equidigital number, since it uses as much as digits as its factorization.

28027817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28027817 is about 5294.1304290695. The cubic root of 28027817 is about 303.7594219954.

Adding to 28027817 its reverse (71872082), we get a palindrome (99899899).

The spelling of 28027817 in words is "twenty-eight million, twenty-seven thousand, eight hundred seventeen".