78
6 x 13
(2x3) x 13
The numbers 2, 3, and 13 are prime numbers, so the factor tree is complete.
An alternate version of a factor tree for 78 is:
78
2 x 39
2 x (3x13)
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188 94,2 47,2,2
24 12,2 6,2,2 3,2,2,2
42,2 21,2,2 7,3,2,2
150 75,2 25,3,2 5,5,3,2
340 170,2 85,2,2 17,5,2,2