28 and its factors

Number Theory Level 1

28 is a perfect number. What is the sum of the reciprocal of the factors of the number 28.


The answer is 2.

Siva Prasad by Siva Prasad , 20, India

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2 solutions

1+1/2+1/4+1/7+1/14+1/28=2

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Sunil Pradhan
Apr 2, 2014

sum of reciprocals of divisors of perfect numbers is 2

2 Helpful 0 Interesting 0 Brilliant 0 Confused

what does it mean?

Yasser AL Hadloly - 7 years, 2 months ago

divisors of 28 are 1, 2, 4, 7, 14, 28

1/1 + 1/2 + 1/4 + 1/7 + 1/14 + 1/28 = 2

Sunil Pradhan - 7 years, 2 months ago

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