504

504 = 2³ x 3² x 7.

504 = 24 x 21 = 42 x 12.

504 is 200200 in base 3 and 4004 in base 5.

504 is a tribonacci number.

504 is a refactorable number. The number of divisors of the number divides the number.

Section 504 of the Rehabilitation Act of 1973 is a federal law designed to protect the rights of individuals with disabilities in programs and activities that receive federal financial assistance from the U.S. Department of Education.

Source: On-Line Encyclopedia of Integer Sequences