1, 3, 9 and 27
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1 3 9 27 81
1,2,3,4,6,8,12,24
59
1, 2, 3, 4, 6, 8, 12, 24 (sum = 60)
Find the sum of the proper divisors of that number.a perfect number equals the sum of its proper divisorsa deficient number is greater than the sum of its proper divisorsan abundant number is less than the sum of its proper divisors