What two numbers add up to 6404?

There are infinite combinations of two numbers that add up to 6404. Here are some examples using negative numbers:

-1 + 6405 = 6404
-2 + 6406 = 6404
-3 + 6407 = 6404
...

Here are some examples using two fractions that will add up to 6404:

6404/2 + 6404/2 = 6404
12808/3 + 6404/3 = 6404
19212/4 + 6404/4 = 6404
...

And here are some examples using two decimal numbers that will add up to 6404:

1.25 + 6402.75 = 6404
2.50 + 6401.5 = 6404
3.75 + 6400.25 = 6404
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 6404?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 6404. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 6404?" has 3202 answers:

1 + 6403 = 6404
2 + 6402 = 6404
3 + 6401 = 6404
.
.
3200 + 3204 = 6404
3201 + 3203 = 6404
3202 + 3202 = 6404

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 6404 by 2 and then rounded down to the nearest whole number if necessary.

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