Alright, let's work through 78487509 times 27987371 step by step
78487509 × 27987371 = 27987371 × (78487509)
+ 27987371 × 9 which equals 251886339
+ 27987371 × 00 yielding 0
+ 27987371 × 500 yielding 13993685500
+ 27987371 × 7000 that equals 195911597000
+ 27987371 × 80000 giving us 2238989680000
+ 27987371 × 400000 which equals 11194948400000
+ 27987371 × 8000000 yielding 223898968000000
+ 27987371 × 70000000 that results in 1959115970000000

= 2196659033248839
