# Check wheth

Given, number is 61479.

Need to find out the number is divisible by 81

Prime factors of 81 = 9 × 9

it is enough to find the number is divisible by 9

To test the number is divisible by 9 it can be found by summing of the digits

6 + 1 + 4 + 7 + 9 = 27

number 27 is divisible by 9

Hence, 61479 is divisible by 81.

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