Latest Infosys Aptitude Question SOLUTION: A perfect number is defined as a number the sum of whose divisors (excluding the number itself, but including 1) is equal to the number itself. 6 is the lowest perfect number. fi

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A perfect number is defined as a number the sum of whose divisors (excluding the number itself, but including 1) is equal to the number itself. 6 is the lowest perfect number. find the second lowest number.
a)12
b)14
c)28
d)496

Asked In Infosys (12 years ago)

Unsolved Read Solution (5)

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Read Solution (5) :

srujan  (12 years ago)

The first perfect number is 6, because 1, 2, and 3 are its proper positive divisors, and 1 + 2 + 3 = 6. Equivalently, the number 6 is equal to half the sum of all its positive divisors: ( 1 + 2 + 3 + 6 ) / 2 = 6.
The next perfect number is 28 = 1 + 2 + 4 + 7 + 14. This is followed by the perfect numbers 496 and 8128

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Sudip Kumar Maji  (10 years ago)

next will be 28(1+2+4+7+14).

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Rashi Agarwal  (9 years ago)

496 will be the next perfect no.

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Indrajit Gupta  (9 years ago)

28 is divisible by 2,4,7 and 14. the sum of the divisors of 28 including 1 is 1+2+4+7+14 = 28. So acc to defn 28 is a perfect no.

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SIJI JOHN  (5 years ago)

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

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