78
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78
Note that 26x3=78. Next note that 78 divided by 6 is 13. This tells us 78 has 26 and 6 as factors and clearly it is less than 85.
78
78 is the answer 78/6 = 13 78/26 = 3
The factors of 26 are 1, 2, 13. And if you add them together (1+2+13) the answer is 16 which is less than 26 so it is an deficient number.