They are the numbers that have more than two factors
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All of them except for 61 and 67 which are prime numbers
They are all: -positive numbers -composite numbers (have more than 2 factors) -integers
60 and 80 :D
It is: 12+14+15+16+18 = 75
60, 72, 84, 90 and 96 all have 12 factors.