Alright, let's work through 26828312 times 52178890 step by step
26828312 × 52178890 = 52178890 × (26828312)
+ 52178890 × 2 yielding 104357780
+ 52178890 × 10 that is equal 521788900
+ 52178890 × 300 yielding 15653667000
+ 52178890 × 8000 which equals 417431120000
+ 52178890 × 20000 producing 1043577800000
+ 52178890 × 800000 what gives us 41743112000000
+ 52178890 × 6000000 that results in 313073340000000
+ 52178890 × 20000000 what gives us 1043577800000000

= 1399871540733680
