Alright, let's work through 81612200 times 10634128 step by step
81612200 × 10634128 = 10634128 × (81612200)
+ 10634128 × 0 that is equal 0
+ 10634128 × 00 that is equal 0
+ 10634128 × 200 that equals 2126825600
+ 10634128 × 2000 yielding 21268256000
+ 10634128 × 10000 that is equal 106341280000
+ 10634128 × 600000 giving us 6380476800000
+ 10634128 × 1000000 that is equal 10634128000000
+ 10634128 × 80000000 yielding 850730240000000

= 867874581161600
