The "57" that still graces the bottles of miscellaneous Heinz products is actually a misnomer of sorts. At the time the number was introduced to the logo (and as a slogan), the company boasted over 60 different products. Henry Heinz was being completely random when he "cast about" for a suitable number. He liked how 57 looked and sounded, and so the slogan and icon were born. Since then, Heinz has had a long history of 57s -- including their 2001 purchase of the Pittsburgh Steeler's field... for $57 million dollars.
Read here or here for more information.
If you didn't catch on to my extreme subtlety, I'm going to start play "catchup" here on the blog. Don't be surprised when you're inundated with posts :) hehehe