No problem, we've got 80802987 and 43471312 to multiply
80802987 × 43471312 = 43471312 × (80802987)
+ 43471312 × 7 which equals 304299184
+ 43471312 × 80 what gives us 3477704960
+ 43471312 × 900 yielding 39124180800
+ 43471312 × 2000 producing 86942624000
+ 43471312 × 00000 giving us 0
+ 43471312 × 800000 what gives us 34777049600000
+ 43471312 × 0000000 resulting in 0
+ 43471312 × 80000000 giving us 3477704960000000

= 3512611858408944
