tl;dr  RSA with the following details:- `N = P**8 * Q * R`- `M` is divisible by P, thus **not** co-prime with `N`- `E` and `D` are usual RSA parameters: `E = 65537` and `E*D ≡ 1 (mod φ(N))`- `C = M**E (mod N)` is known- `D(C) = (M**E)**D (mod N)` is known as well
`M = P**3 * X` and find `P` and `X` separately.