Alright, let's work through 86487080 times 84131038 step by step
86487080 × 84131038 = 84131038 × (86487080)
+ 84131038 × 0 that equals 0
+ 84131038 × 80 which equals 6730483040
+ 84131038 × 000 producing 0
+ 84131038 × 7000 resulting in 588917266000
+ 84131038 × 80000 giving us 6730483040000
+ 84131038 × 400000 that equals 33652415200000
+ 84131038 × 6000000 that is equal 504786228000000
+ 84131038 × 80000000 yielding 6730483040000000

= 7276247813989040
