Alright, let's work through 87133475 times 82642405 step by step
87133475 × 82642405 = 82642405 × (87133475)
+ 82642405 × 5 producing 413212025
+ 82642405 × 70 that equals 5784968350
+ 82642405 × 400 producing 33056962000
+ 82642405 × 3000 which equals 247927215000
+ 82642405 × 30000 which equals 2479272150000
+ 82642405 × 100000 giving us 8264240500000
+ 82642405 × 7000000 which equals 578496835000000
+ 82642405 × 80000000 giving us 6611392400000000

= 7200919930007375
