No problem, we've got 81389418 and 84290784 to multiply
81389418 × 84290784 = 84290784 × (81389418)
+ 84290784 × 8 giving us 674326272
+ 84290784 × 10 which equals 842907840
+ 84290784 × 400 which equals 33716313600
+ 84290784 × 9000 what gives us 758617056000
+ 84290784 × 80000 producing 6743262720000
+ 84290784 × 300000 what gives us 25287235200000
+ 84290784 × 1000000 yielding 84290784000000
+ 84290784 × 80000000 that is equal 6743262720000000

= 6860377852523712
