Alright, let's work through 61397264 times 77878152 step by step
61397264 × 77878152 = 77878152 × (61397264)
+ 77878152 × 4 what gives us 311512608
+ 77878152 × 60 giving us 4672689120
+ 77878152 × 200 that is equal 15575630400
+ 77878152 × 7000 which equals 545147064000
+ 77878152 × 90000 yielding 7009033680000
+ 77878152 × 300000 giving us 23363445600000
+ 77878152 × 1000000 giving us 77878152000000
+ 77878152 × 60000000 which equals 4672689120000000

= 4781505458176128
