If you're talking decimals and irrationals, let's go with infinity.
(1264.9 +.1) (1264.91+.09) (1264+.911+.089)
and you can keep doing that over and over.
If only positive integers, than for odd numbers divide by two and round down from .5, for even it is just that number divided by 2. So it should be 632.
Try it out with smaller numbers and see the pattern.
With whole numbers, there are five ways.
There is an infinite number of ways three numbers can have the sum of 11
Five numbers can be arranged in 5! = 120 ways.
Four numbers can be sorted 24 ways.
30
Infinitely many. 1 + 1328 2 + 1327 and so on. Then consider numbers to 1 decimal place (dp). 1.1 + 1327.9 1.2 + 1327.8 etc. Next you can include numbers to 2 dp, 3 dp, 4 dp all the way to infinitely many dp. Next you can look at sums of 3 number, 4 number, ... infinitely many numbers.
mixed number
With whole numbers, there are five ways.
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One... numbers
24 ways
There is an infinite number of ways three numbers can have the sum of 11
8! = 40320 ways.
120
Five numbers can be arranged in 5! = 120 ways.
54,45,5.4,4.5
there are 36 ways to add up to