No problem, we've got 84321979 and 72016961 to multiply
84321979 × 72016961 = 72016961 × (84321979)
+ 72016961 × 9 giving us 648152649
+ 72016961 × 70 producing 5041187270
+ 72016961 × 900 what gives us 64815264900
+ 72016961 × 1000 that is equal 72016961000
+ 72016961 × 20000 which equals 1440339220000
+ 72016961 × 300000 that results in 21605088300000
+ 72016961 × 4000000 what gives us 288067844000000
+ 72016961 × 80000000 which equals 5761356880000000

= 6072612673085819
