Alright, let's work through 51320438 times 13318390 step by step
51320438 × 13318390 = 13318390 × (51320438)
+ 13318390 × 8 producing 106547120
+ 13318390 × 30 producing 399551700
+ 13318390 × 400 giving us 5327356000
+ 13318390 × 0000 producing 0
+ 13318390 × 20000 that is equal 266367800000
+ 13318390 × 300000 that equals 3995517000000
+ 13318390 × 1000000 giving us 13318390000000
+ 13318390 × 50000000 which equals 665919500000000

= 683505608254820
