Alright, let's work through 67820903 times 5208429 step by step
67820903 × 5208429 = 5208429 × (67820903)
+ 5208429 × 3 resulting in 15625287
+ 5208429 × 00 that equals 0
+ 5208429 × 900 resulting in 4687586100
+ 5208429 × 0000 yielding 0
+ 5208429 × 20000 what gives us 104168580000
+ 5208429 × 800000 resulting in 4166743200000
+ 5208429 × 7000000 giving us 36459003000000
+ 5208429 × 60000000 which equals 312505740000000

= 353240357991387
