At least thirty-six of them.
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Stings with four factor that make 840
840=2*2*2*3*5*7
2 x 420 3 x 280 4 x 210 5 x 168 6 x 140
There are a lot like 3x56x5 and there are a thousand more but i just don't want to write them all :)
36 of them.