Alright, let's work through 79439895 times 86678 step by step
79439895 × 86678 = 86678 × (79439895)
+ 86678 × 5 yielding 433390
+ 86678 × 90 which equals 7801020
+ 86678 × 800 that is equal 69342400
+ 86678 × 9000 which equals 780102000
+ 86678 × 30000 giving us 2600340000
+ 86678 × 400000 which equals 34671200000
+ 86678 × 9000000 resulting in 780102000000
+ 86678 × 70000000 that results in 6067460000000

= 6885691218810
