Alright, let's work through 87701023 times 42505501 step by step
87701023 × 42505501 = 42505501 × (87701023)
+ 42505501 × 3 giving us 127516503
+ 42505501 × 20 what gives us 850110020
+ 42505501 × 000 that is equal 0
+ 42505501 × 1000 that equals 42505501000
+ 42505501 × 00000 that is equal 0
+ 42505501 × 700000 resulting in 29753850700000
+ 42505501 × 7000000 that results in 297538507000000
+ 42505501 × 80000000 what gives us 3400440080000000

= 3727775920827523
