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It is 17

by lcm we get the factors of 7803.
they are 3×3×3×17×17= 3³×17²
if we want perfect cube we need 3³×17³
so we have to multiply with 17
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Factors of 7803 are 3,3,3,17,17
 that give 7803=3³*17²
 we have to multiply by to 17 to get 3³*17³=132651=51³
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