No problem, we've got 78021441 and 20913427 to multiply
78021441 × 20913427 = 20913427 × (78021441)
+ 20913427 × 1 that equals 20913427
+ 20913427 × 40 what gives us 836537080
+ 20913427 × 400 that is equal 8365370800
+ 20913427 × 1000 that equals 20913427000
+ 20913427 × 20000 resulting in 418268540000
+ 20913427 × 000000 giving us 0
+ 20913427 × 8000000 producing 167307416000000
+ 20913427 × 70000000 giving us 1463939890000000

= 1631695710788307
