Alright, let's work through 84720056 times 85639037 step by step
84720056 × 85639037 = 85639037 × (84720056)
+ 85639037 × 6 what gives us 513834222
+ 85639037 × 50 that results in 4281951850
+ 85639037 × 000 resulting in 0
+ 85639037 × 0000 yielding 0
+ 85639037 × 20000 that results in 1712780740000
+ 85639037 × 700000 resulting in 59947325900000
+ 85639037 × 4000000 yielding 342556148000000
+ 85639037 × 80000000 what gives us 6851122960000000

= 7255344010426072
