28128017 has 2 divisors, whose sum is σ = 28128018. Its totient is φ = 28128016.

The previous prime is 28127987. The next prime is 28128019. The reversal of 28128017 is 71082182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18696976 + 9431041 = 4324^2 + 3071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28128017 is a prime.

Together with 28128019, 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 (28128019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14064008 + 14064009.

It is an arithmetic number, because the mean of its divisors is an integer number (14064009).

Almost surely, 2^28128017 is an apocalyptic number.

It is an amenable number.

28128017 is a deficient number, since it is larger than the sum of its proper divisors (1).

28128017 is an equidigital number, since it uses as much as digits as its factorization.

28128017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 28128017 is about 5303.5852967592. The cubic root of 28128017 is about 304.1209734660.

The spelling of 28128017 in words is "twenty-eight million, one hundred twenty-eight thousand, seventeen".