I thought that was a trick question. We're 4.5 billion years old so that would be...let me see...divide that number by this one, carry the three...and it's...4.5 billion? Which would be wrong, as...
'All told, the Earth spirals away from the Sun at a rate of about 1.5 cm every year, causing its orbital speed to drop by about 3 nanometers-per-second over that timescale. If you add up all the tiny changes that have occurred over our Solar System’s history, you’ll find that we’re now about 50,000 km farther away in our orbit than we were 4.5 billion years ago, and move at about ~10 meters-per-second slower around the Sun than we did way back when.'
Ask Ethan: Does Earth Orbit The Sun More Slowly With Each New Year?
My very rough maths then gives us 4,499,999,999.9997 orbits. We're short of the finish line by just over 300km.