287533287 has 2 valid decompositions (28753 x 3287 and 2875 x 33287), leading to 2 valid dates. But 328728753 has 1 valid decomposition only (3287 x 28753), and only the date 9451-11-11 is valid for this value.
thank you,The most accurate breakdown is one that includes only one date.
You have an initial number(328728753), which is the result of combining a and b, and you can only split this number into two others(3287 28753, 3287287 53, 32872 8753, …), and all other calculations you do with these two numbers obtained in the process of splitting. You should not swap them and combine them again.