Alright, let's work through 13428199 times 28145103 step by step
13428199 × 28145103 = 28145103 × (13428199)
+ 28145103 × 9 which equals 253305927
+ 28145103 × 90 giving us 2533059270
+ 28145103 × 100 that is equal 2814510300
+ 28145103 × 8000 yielding 225160824000
+ 28145103 × 20000 giving us 562902060000
+ 28145103 × 400000 resulting in 11258041200000
+ 28145103 × 3000000 that equals 84435309000000
+ 28145103 × 10000000 resulting in 281451030000000

= 377938043959497
