A Pennsylvania man has set a record by memorizing pi up to 12,887 digits. The 40-year-old man Mark Umile is a filing clerk from Upper Darby.

According to the Philadelphia Inquirer, Umile figured the problem by hand, writing down the results 1,000 digits at a time -- and then memorized the number. The mathematical constant đ is an irrational real number, approximately equal to 3.141592653..., which is the ratio of a circle's circumference to its diameter in Euclidean geometry, and has many uses in mathematics, physics, and engineering.

His wife Marriyan says she is really proud her husband could remember such long digits and she is not even capable of remembering a phone number.

Umile broke the previous North American record of 10,980, however he still has an uphill battle if he wants to tackle the world record of 100,000 digits, which was set in Japan.

However, he has yet another record for memorizing 905 digits of the mathematical constant "e" and the first 5,544 digits of the square root of two.