Alright, let's work through 82435378 times 62853657 step by step
82435378 × 62853657 = 62853657 × (82435378)
+ 62853657 × 8 yielding 502829256
+ 62853657 × 70 yielding 4399755990
+ 62853657 × 300 what gives us 18856097100
+ 62853657 × 5000 that equals 314268285000
+ 62853657 × 30000 yielding 1885609710000
+ 62853657 × 400000 giving us 25141462800000
+ 62853657 × 2000000 which equals 125707314000000
+ 62853657 × 80000000 which equals 5028292560000000

= 5181364973477346
