The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 3268.8903\\[1 em]x_2 &= -0.9451+78.6018i\\[1 em]x_3 &= -0.9451-78.6018i \end{aligned} $$Polynomial $ 8x^3-26136x^2+x-161591466 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.