Just read an article summary from the Journal of Marketing Research on a twitter tip by Alex Bellos about the preference for composite numbers in product names... Her is most of the good stuff.
A series of experiments documents the influence of numbers on the liking of brands. For example, an imaginary brand name for anti-dandruff shampoo (Zinc) is more liked when it includes a common product number (e.g., Zinc 24) than when with includes a prime number (e.g., Zinc 31). The research also shows that the presence of the operands responsible for the sum or product further enhance the liking of a brand name. For example, not only is a Volvo S12 more liked than a Volvo S29, but liking is further enhanced when an advertisement for a Volvo S12 includes a license plate with the numbers 2 and 6. The operands 2 and 6 make 12 more familiar because they encourage the subconscious generation of the number 12.
The influence of available operands on liking for the number brand extends to advertising claims. The authors conducted a study in which consumers were asked to make a choice between V8 and Campbell’s tomato juice. Some consumers saw a V8 advertisement that stated, “Get a full day’s supply of 4 essential vitamins and 2 minerals with a bottle of V8” whereas other saw an advertisement that stated “Get a full day’s supply of essential vitamins and minerals with a bottle of V8.” More consumers chose the bottle of V8 when the number 4 and 2 were explicitly mentioned in the claim. Creating similar advertisements for Campbell’s tomato juice did not influence preferences for Campbell’s.