Alright, let's work through 87556771 times 8551407 step by step
87556771 × 8551407 = 8551407 × (87556771)
+ 8551407 × 1 giving us 8551407
+ 8551407 × 70 what gives us 598598490
+ 8551407 × 700 which equals 5985984900
+ 8551407 × 6000 producing 51308442000
+ 8551407 × 50000 yielding 427570350000
+ 8551407 × 500000 which equals 4275703500000
+ 8551407 × 7000000 that equals 59859849000000
+ 8551407 × 80000000 which equals 684112560000000

= 748733584426797
