[i]Discussion
The biggest value (positive or negative) that can be expressed as an integer in AppleScript is ±536870911, which is equal to ±(2^29 1). Larger integers are converted to real numbers, expressed in exponential notation, when scripts are compiled.

Note: The smallest possible integer value is actually -536870912 (-2^29), but it can only be generated as a result of an expression. If you enter it directly into a script, it will be converted to a real when you compile.
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Thanks for the links, guys. According to the links the number should convert to a real, which is does, but the result is still wrong. Looks like a bug with Evernote then. I don’t care about the exact value anyways. I just need to know that the next note still fits into the upload quota.