No problem, we've got 80644270 and 78644828 to multiply
80644270 × 78644828 = 78644828 × (80644270)
+ 78644828 × 0 giving us 0
+ 78644828 × 70 that results in 5505137960
+ 78644828 × 200 producing 15728965600
+ 78644828 × 4000 that equals 314579312000
+ 78644828 × 40000 yielding 3145793120000
+ 78644828 × 600000 yielding 47186896800000
+ 78644828 × 0000000 resulting in 0
+ 78644828 × 80000000 which equals 6291586240000000

= 6342254743335560
