Alright, let's work through 66871874 times 87884107 step by step
66871874 × 87884107 = 87884107 × (66871874)
+ 87884107 × 4 what gives us 351536428
+ 87884107 × 70 producing 6151887490
+ 87884107 × 800 that results in 70307285600
+ 87884107 × 1000 yielding 87884107000
+ 87884107 × 70000 producing 6151887490000
+ 87884107 × 800000 resulting in 70307285600000
+ 87884107 × 6000000 resulting in 527304642000000
+ 87884107 × 60000000 giving us 5273046420000000

= 5876974929906518
