Alright, let's work through 70634863 times 80398336 step by step
70634863 × 80398336 = 80398336 × (70634863)
+ 80398336 × 3 that is equal 241195008
+ 80398336 × 60 what gives us 4823900160
+ 80398336 × 800 producing 64318668800
+ 80398336 × 4000 that equals 321593344000
+ 80398336 × 30000 which equals 2411950080000
+ 80398336 × 600000 which equals 48239001600000
+ 80398336 × 0000000 producing 0
+ 80398336 × 70000000 what gives us 5627883520000000

= 5678925448787968
