Alright, let's work through 99507542 times 77687471 step by step
99507542 × 77687471 = 77687471 × (99507542)
+ 77687471 × 2 yielding 155374942
+ 77687471 × 40 which equals 3107498840
+ 77687471 × 500 yielding 38843735500
+ 77687471 × 7000 that results in 543812297000
+ 77687471 × 00000 that is equal 0
+ 77687471 × 500000 giving us 38843735500000
+ 77687471 × 9000000 yielding 699187239000000
+ 77687471 × 90000000 that is equal 6991872390000000

= 7730489283406282
