63,504

Number
$63 \, 504$ (sixty-three thousand, five hundred and four) is:


 * $2^4 \times 3^4 \times 7^2$


 * The $252$nd square number:
 * $63 \, 504 = 252 \times 252$


 * The smallest integer which can be expressed as the product of an integer and its reversal in two different ways which is not a multiple of $10$:
 * $63 \, 504 = 252 \times 252 = 144 \times 441 = \paren {2^2 \times 3^2 \times 7} \times \paren {2^2 \times 3^2 \times 7} = \paren {2^4 \times 3^2} \times \paren {3^2 \times 7^2}$

Also see

 * Integers Expressible as Product of Number and Reversal in 2 Different Ways