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An integer is a perfect number if it is equal to the sum of its positive divisors, not including the number itself.

The divisors of 28 are : 1, 2, 4, 7 and 14....and these sum to 28. Thus 28 is a perfect number.

In Number Theory there is a theorem that, If 2k - 1 is prime then 2k-1(2k - 1) is perfect.

If we put k = 3 then 2k - 1 = 23 - 1 = 8 - 1 = 7 is prime.

And, 23-1 (23 - 1) = 22(8 - 1) = 4 x 7 = 28....is the resultant perfect number.

Q: Is 28 abundant deficient perferct or near perfect?

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an example of a near perfect number is 2, 4 or 16.-these are near-perfect numbers because their factors add up to one less than the number itself.

22 is not a perfect number but 6, 28, 496 and 8128 are perfect numbers.

Credit scale is a simple rating system giving numbers to credit depending on a number of factors. A lot of scales you will find on the internet start near 300 (poor) and go up to 850 (perfect)

In near perfect consition I would put it at $400 . . . maybe. They are around in so-so condition for about $250. A good deal is had for $175 for one in so-so condition.

near zero

Related questions

as near perfect as possible

No, it is not near a perfect number. The first four known perfect numbers are 6, 28, 496 and 8,128.

No, it is not near a perfect number. The first four known perfect numbers are 6, 28, 496 and 8,128.

No, it is not: nowhere near!

No

Armando Galarraga's near-perfect game happened in 2010.

an example of a near perfect number is 2, 4 or 16.-these are near-perfect numbers because their factors add up to one less than the number itself.

Oil is abundant there.

Yes.

Near mint means about 90% perfect condition, and about 10% unperfect. Near mint can appear on most things(usually things people are trying to sell) so if you see near mint, it means it is about perfect as the item is claimed to be. NOTE: "Mint" means perfect, "Near Mint" means almost perfect.

No, it is not.

no