What is the greatest prime factor of 78?

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What is the greatest prime factor of 78?

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Answer 1 · 2016-12-25T07:12:26

$13$ $13$ is the greatest prime factor of $78$ $78$ .

Explanation:

Last digit of $78$ $78$ is $8$ $8$ , an even number and hence divisible by $2$ $2$ . Further, sum of the digits is $7 + 8 = 15$ $7+8=15$ , divisible by $3$ $3$ .

Hence $78$ $78$ is divisible by prime numbers $2$ $2$ ad $3$ $3$ . Dividing $78$ $78$ by these numbers, we get $13$ $13$ and hence

$78 = 2 \times 3 \times 13$ $78=2xx3xx13$

Hence, $13$ $13$ is the greatest prime factor of $78$ $78$ .

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What is the greatest prime factor of 78?

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