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

$factorof72=2\times 2\times 2\times 3\times 3\phantom{\rule{0ex}{0ex}}u\mathrm{sin}gfactorproperdivisor=1,2,3,4,6,8,9,12,18,24,36,72\phantom{\rule{0ex}{0ex}}sosumofproperdivisor=2+3+4+6+8+9+12+18+24+36=122answer$

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