Alright, let's work through 99564284 times 64073803 step by step
99564284 × 64073803 = 64073803 × (99564284)
+ 64073803 × 4 producing 256295212
+ 64073803 × 80 yielding 5125904240
+ 64073803 × 200 producing 12814760600
+ 64073803 × 4000 that is equal 256295212000
+ 64073803 × 60000 that results in 3844428180000
+ 64073803 × 500000 giving us 32036901500000
+ 64073803 × 9000000 yielding 576664227000000
+ 64073803 × 90000000 that equals 5766642270000000

= 6379462318852052
