Alright, let's work through 28396820 times 14436388 step by step
28396820 × 14436388 = 14436388 × (28396820)
+ 14436388 × 0 producing 0
+ 14436388 × 20 which equals 288727760
+ 14436388 × 800 what gives us 11549110400
+ 14436388 × 6000 resulting in 86618328000
+ 14436388 × 90000 resulting in 1299274920000
+ 14436388 × 300000 that results in 4330916400000
+ 14436388 × 8000000 that results in 115491104000000
+ 14436388 × 20000000 yielding 288727760000000

= 409947511486160
