28686617 has 2 divisors, whose sum is σ = 28686618. Its totient is φ = 28686616.

The previous prime is 28686611. The next prime is 28686629. The reversal of 28686617 is 71668682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16777216 + 11909401 = 4096^2 + 3451^2 .

It is a cyclic number.

It is not a de Polignac number, because 28686617 - 2²⁰ = 27638041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28686611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343308 + 14343309.

It is an arithmetic number, because the mean of its divisors is an integer number (14343309).

Almost surely, 2^28686617 is an apocalyptic number.

It is an amenable number.

28686617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28686617 is an equidigital number, since it uses as much as digits as its factorization.

28686617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 28686617 is about 5355.9888909519. The cubic root of 28686617 is about 306.1209917824.

The spelling of 28686617 in words is "twenty-eight million, six hundred eighty-six thousand, six hundred seventeen".