$\forall m,n \in \Bbb N$ : $\ 56786730\mid mn(m^{60}-n^{60})$

elementary-number-theory divisibility

Hint $\ $ Apply little Fermat, noticing that $\rm\displaystyle\ 56786730\ = \!\!\prod_{\begin{array}\rm p\ prime\\ \rm p-1\mid\, 60\end{array}}\! p$

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