Answer:
16 = 2 × 2 × 2 × 2
28 = 2 × 2 × 7
40 = 2 × 2 × 2 × 5
77 = 7 × 11
LCM = 2 × 2 × 2 × 2 × 5 × 7 × 11 = 6,160
6,160 - 29 = 6,131
The number is 6,131.
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