I have a lot of mileage 290769 what does that mean

by what you're stating,you have(290769 miles on it and what does that mean)?one would assume that you have a good car! I have a vehicle,2000 model Ford with almost 350,000 miles on it and a 98 Camry with 210,000 miles on it,and a 95 Tercel with 240,000 miles on it!