The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 3437.8986\\[1 em]x_2 &= -85.4493+761.7286i\\[1 em]x_3 &= -85.4493-761.7286i \end{aligned} $$Polynomial $ 8x^3-26136x^2+x-16159003005 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.