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What's the total sum of positive factors of 1344. Plz,

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What's the total sum of positive factors of 1344. Plz, [#permalink] New post 06 Dec 2005, 19:07
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What's the total sum of positive factors of 1344.

Plz, support your answer with expln.
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 [#permalink] New post 06 Dec 2005, 19:59
1344= 2^6*7*3

sum of factores

1+2+4+8+16+32+64+7+3=200
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 [#permalink] New post 06 Dec 2005, 22:06
cool_jonny009 wrote:
1344= 2^6*7*3

sum of factores

1+2+4+8+16+32+64+7+3=200


Are you sure this is what it adds up to? I get 137...
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Re: Sum of numbers (PS) [#permalink] New post 06 Dec 2005, 22:47
rlevochkin wrote:
What's the total sum of positive factors of 1344.

Plz, support your answer with expln.


I get 4064.....

1344 = 2^6 * 3^1* 7^1

Total sum = (2^0 + 2^1 + 2^2 + 2^3 + 2^4 + 2^5 + 2^6)*(3^0 + 3^1)* (7^0 + 7^1) = (127)*(4)*(8) = 4064
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 [#permalink] New post 08 Dec 2005, 23:29
sum, not product right?

1+2+3+4+7+8+56+224+672+1344= 2321.
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 [#permalink] New post 09 Dec 2005, 05:00
its 4064 and formula is: a^x*b^y*c^z=(a^(x+1))/(a-1)*(b^(y+1))/(b-1)*(c^(z+1))/(a-1) ! looks time-consuming, but actually its very simple !
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  [#permalink] 09 Dec 2005, 05:00
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