28289017 has 2 divisors, whose sum is σ = 28289018. Its totient is φ = 28289016.

The previous prime is 28288999. The next prime is 28289021. The reversal of 28289017 is 71098282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16032016 + 12257001 = 4004^2 + 3501^2 .

It is a cyclic number.

It is not a de Polignac number, because 28289017 - 2⁷ = 28288889 is a prime.

It is equal to p_1758295 and since 28289017 and 1758295 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28289047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14144508 + 14144509.

It is an arithmetic number, because the mean of its divisors is an integer number (14144509).

Almost surely, 2^28289017 is an apocalyptic number.

It is an amenable number.

28289017 is a deficient number, since it is larger than the sum of its proper divisors (1).

28289017 is an equidigital number, since it uses as much as digits as its factorization.

28289017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28289017 is about 5318.7420505228. The cubic root of 28289017 is about 304.7001155259.

The spelling of 28289017 in words is "twenty-eight million, two hundred eighty-nine thousand, seventeen".