Alright, let's work through 78797997 times 28600378 step by step
78797997 × 28600378 = 28600378 × (78797997)
+ 28600378 × 7 what gives us 200202646
+ 28600378 × 90 resulting in 2574034020
+ 28600378 × 900 giving us 25740340200
+ 28600378 × 7000 resulting in 200202646000
+ 28600378 × 90000 producing 2574034020000
+ 28600378 × 700000 giving us 20020264600000
+ 28600378 × 8000000 that equals 228803024000000
+ 28600378 × 70000000 what gives us 2002026460000000

= 2253652499842866
