Alright, let's work through 87599713 times 45339540 step by step
87599713 × 45339540 = 45339540 × (87599713)
+ 45339540 × 3 that is equal 136018620
+ 45339540 × 10 which equals 453395400
+ 45339540 × 700 which equals 31737678000
+ 45339540 × 9000 producing 408055860000
+ 45339540 × 90000 that is equal 4080558600000
+ 45339540 × 500000 what gives us 22669770000000
+ 45339540 × 7000000 that results in 317376780000000
+ 45339540 × 80000000 resulting in 3627163200000000

= 3971730691552020
