Alright, let's work through 99615998 times 87646239 step by step
99615998 × 87646239 = 87646239 × (99615998)
+ 87646239 × 8 resulting in 701169912
+ 87646239 × 90 which equals 7888161510
+ 87646239 × 900 that is equal 78881615100
+ 87646239 × 5000 that is equal 438231195000
+ 87646239 × 10000 which equals 876462390000
+ 87646239 × 600000 that is equal 52587743400000
+ 87646239 × 9000000 giving us 788816151000000
+ 87646239 × 90000000 giving us 7888161510000000

= 8730967568931522
