What will come in the place of question mark (?) in the following number series ?
840, ?, 420, 140, 35, 7
Each number is divided by consecutive natural numbers
840 $$\div 1$$ = 840
840 $$\div 2$$ = 420
420 $$\div 3$$ = 140
140 $$\div 4$$ = 35
35 $$\div 5$$ = 7
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