Alright, let's work through 28204869 times 64838868 step by step
28204869 × 64838868 = 64838868 × (28204869)
+ 64838868 × 9 that is equal 583549812
+ 64838868 × 60 yielding 3890332080
+ 64838868 × 800 that equals 51871094400
+ 64838868 × 4000 resulting in 259355472000
+ 64838868 × 00000 that equals 0
+ 64838868 × 200000 that is equal 12967773600000
+ 64838868 × 8000000 that equals 518710944000000
+ 64838868 × 20000000 that is equal 1296777360000000

= 1828771778048292
