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Dreams' Calculator gadget uses 32 bit floating point numbers, and when converted to decimal, they're not guaranteed to be accurate to more than 6 significant digits. Compared to the true value 1278431424 for the sum of 670588224 and 607843200, the value 1278431488 that you got is accurate to 7 significant digits, which is within the ball park.
If you want to experiment with how floating point numbers work, you might like to have a look at https://evanw.github.io/float-toy/.