No problem, we've got 78478823 and 71921361 to multiply
78478823 × 71921361 = 71921361 × (78478823)
+ 71921361 × 3 giving us 215764083
+ 71921361 × 20 giving us 1438427220
+ 71921361 × 800 what gives us 57537088800
+ 71921361 × 8000 which equals 575370888000
+ 71921361 × 70000 giving us 5034495270000
+ 71921361 × 400000 that results in 28768544400000
+ 71921361 × 8000000 that equals 575370888000000
+ 71921361 × 70000000 giving us 5034495270000000

= 5644303759838103
