If that number were in bytes, it would equal 770,279,405,711,522,064,827,729,959,338,268,345,70 3,541,502,422,075,344,951,107,793,124,790,720,565, 710,760,162.40990734100341796875 Terabytes.
Dividing the original by 1024 four different times will produce the terabytes. It should have came to an even number if we were accurately doubling. Someone screwed up the math somewhere, but I'm too lazy to check who did it.