3640

3640 = 2 x 2 x 2 x 5 x 7 x 13.

The sum of the digits of 3640 (13) is the largest prime factor of 3640 (A052021).

3640 is 111000111000111 in base 2 (binary) and 7070 in base 8. It is 11222211 in base 3, 320320 in base 4, and 4884 in base 9. It uses each of the digits 0, 1, 2, 3, 4 once in base 7 (13420).

3640 is a triple factorial number (A007661).

3640 is the number of regions in a regular 35-gon that are hexagons (A067153).

3640 divides 81³ - 1.

Source: OEIS