Alright, let's work through 87091205 times 77966141 step by step
87091205 × 77966141 = 77966141 × (87091205)
+ 77966141 × 5 producing 389830705
+ 77966141 × 00 that results in 0
+ 77966141 × 200 that results in 15593228200
+ 77966141 × 1000 giving us 77966141000
+ 77966141 × 90000 yielding 7016952690000
+ 77966141 × 000000 that equals 0
+ 77966141 × 7000000 yielding 545762987000000
+ 77966141 × 80000000 that results in 6237291280000000

= 6790165168889905
