Alright, let's work through 86427809 times 53281697 step by step
86427809 × 53281697 = 53281697 × (86427809)
+ 53281697 × 9 that equals 479535273
+ 53281697 × 00 that equals 0
+ 53281697 × 800 yielding 42625357600
+ 53281697 × 7000 which equals 372971879000
+ 53281697 × 20000 that is equal 1065633940000
+ 53281697 × 400000 which equals 21312678800000
+ 53281697 × 6000000 that results in 319690182000000
+ 53281697 × 80000000 yielding 4262535760000000

= 4605020331511873
