Alright, let's work through 787508 times 87439899 step by step
787508 × 87439899 = 87439899 × (787508)
+ 87439899 × 8 resulting in 699519192
+ 87439899 × 00 that is equal 0
+ 87439899 × 500 producing 43719949500
+ 87439899 × 7000 producing 612079293000
+ 87439899 × 80000 that is equal 6995191920000
+ 87439899 × 700000 that results in 61207929300000

= 68859619981692
