Quadratic Equation And Inequalities

Let \(\alpha \in\mathbb{R}\) and let \(\alpha,\beta\) be the roots of the equation \({x^2} + {60^{{1 \over 4}}}x + a = 0\). If \({\alpha ^4} + {\beta ^4} = - 30\), then the product of all possible values of \(a\) is ____________.