Alright, let's work through 87109955 times 63648709 step by step
87109955 × 63648709 = 63648709 × (87109955)
+ 63648709 × 5 which equals 318243545
+ 63648709 × 50 yielding 3182435450
+ 63648709 × 900 that results in 57283838100
+ 63648709 × 9000 that is equal 572838381000
+ 63648709 × 00000 that results in 0
+ 63648709 × 100000 yielding 6364870900000
+ 63648709 × 7000000 resulting in 445540963000000
+ 63648709 × 80000000 which equals 5091896720000000

= 5544436176798095
