No problem, we've got 64490487 and 16197128 to multiply
64490487 × 16197128 = 16197128 × (64490487)
+ 16197128 × 7 that is equal 113379896
+ 16197128 × 80 what gives us 1295770240
+ 16197128 × 400 giving us 6478851200
+ 16197128 × 0000 giving us 0
+ 16197128 × 90000 producing 1457741520000
+ 16197128 × 400000 resulting in 6478851200000
+ 16197128 × 4000000 resulting in 64788512000000
+ 16197128 × 60000000 which equals 971827680000000

= 1044560672721336
