Alright, let's work through 78644989 times 27664001 step by step
78644989 × 27664001 = 27664001 × (78644989)
+ 27664001 × 9 producing 248976009
+ 27664001 × 80 which equals 2213120080
+ 27664001 × 900 yielding 24897600900
+ 27664001 × 4000 what gives us 110656004000
+ 27664001 × 40000 resulting in 1106560040000
+ 27664001 × 600000 which equals 16598400600000
+ 27664001 × 8000000 resulting in 221312008000000
+ 27664001 × 70000000 yielding 1936480070000000

= 2175635054340989
