Alright, let's work through 99331264 times 77611807 step by step
99331264 × 77611807 = 77611807 × (99331264)
+ 77611807 × 4 yielding 310447228
+ 77611807 × 60 producing 4656708420
+ 77611807 × 200 producing 15522361400
+ 77611807 × 1000 that equals 77611807000
+ 77611807 × 30000 producing 2328354210000
+ 77611807 × 300000 giving us 23283542100000
+ 77611807 × 9000000 what gives us 698506263000000
+ 77611807 × 90000000 what gives us 6985062630000000

= 7709278890634048
