Using trigonometry the regular 15 sided pentadecagon will consist of 15 congruent isosceles triangles with 2 equal sides of 57.71681214 cm and 2 equal base angles of 78 degrees including an apex angle of 24 degrees opposite to base side of 24 cm with an apothem or height of 56.45556132 cm hence it follows:-

Area: 0.5*57.71681214^2 *sin(24)*15 = 10162.00104 square cm

Area: 0.5*apothem*perimeter = 10162.00104 square cm

Area: 10162.00104 = 10162 square cm rounded to the nearest integer or whole number

The factors of 8128 are:

1, 2, 4, 8, 16, 32, 64, 127, 254, 508, 1016, 2032, 4064 and 8128.

Hope this helps!
Prime factors are 2, 2, 2, 2, 2, 2, 127

Others are combinations of the prime factors, i.e.

2 x 2 = 4

2 x 2 x 2 = 8

2 x 2 x 2 x 2 = 16

2 x 2 x 2 x 2 x 2 = 32

2 x 2 x 2 x 2 x 2 x 2 = 64

2 x 127 = 254

2 x 2 x 127 = 508

2 x 2 x 2 x 127 = 1016

2 x 2 x 2 x 2 x 127 = 2032

2 x 2 x 2 x 2 x 2 x 127 = 4064