No problem, we've got 80604934 and 10371854 to multiply
80604934 × 10371854 = 10371854 × (80604934)
+ 10371854 × 4 which equals 41487416
+ 10371854 × 30 yielding 311155620
+ 10371854 × 900 which equals 9334668600
+ 10371854 × 4000 giving us 41487416000
+ 10371854 × 00000 that results in 0
+ 10371854 × 600000 that results in 6223112400000
+ 10371854 × 0000000 producing 0
+ 10371854 × 80000000 that equals 829748320000000

= 836022607127636
