No problem, we've got 89721649 and 42399769 to multiply
89721649 × 42399769 = 42399769 × (89721649)
+ 42399769 × 9 what gives us 381597921
+ 42399769 × 40 that is equal 1695990760
+ 42399769 × 600 resulting in 25439861400
+ 42399769 × 1000 giving us 42399769000
+ 42399769 × 20000 that results in 847995380000
+ 42399769 × 700000 yielding 29679838300000
+ 42399769 × 9000000 resulting in 381597921000000
+ 42399769 × 80000000 that equals 3391981520000000

= 3804177191899081
