2 x 2 x 2 x 2 x 5
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7*5*4*3*2 Is the longest factor string of 840
The longest factor string is 2x2x2x3x13. It is always best to list your factor string from the least to greatest number.
The longest factor string of 100 is: 2*2*5*5=100
2x2x5
longest string for 800 =2*2*2*2*2*5*5