the sum of proper divisors of 72(1 and 72 excluded)

Dear student,

factor of 72 =2×2×2×3×3using factor proper divisor =1,2,3,4,6,8,9,12,18,24,36,72so sum of proper divisor =2+3+4+6+8+9+12+18+24+36=122 answer
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