What is the greatest prime factor of 78?

1 Answer
Shwetank Mauria
Dec 25, 2016

13 is the greatest prime factor of 78.

Explanation:

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

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

78=2xx3xx13

Hence, 13 is the greatest prime factor of 78.

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