Alright, let's work through 87065358 times 21306425 step by step
87065358 × 21306425 = 21306425 × (87065358)
+ 21306425 × 8 what gives us 170451400
+ 21306425 × 50 that is equal 1065321250
+ 21306425 × 300 what gives us 6391927500
+ 21306425 × 5000 that equals 106532125000
+ 21306425 × 60000 that results in 1278385500000
+ 21306425 × 000000 resulting in 0
+ 21306425 × 7000000 that results in 149144975000000
+ 21306425 × 80000000 which equals 1704514000000000

= 1855051520325150
