86500
86499.99... to the nearest thousand 86049.99... to the nearest hundred 86004.99... to the nearest ten etc Personally, I would advise that 86500 is rounded down to 86000 so as to avoid rounding bias but to many school teachers rounding bias is too complicated to explain to youngsters.
$91,547.27
86.5kg = 86500g. 86500-1450 is 85050g or 85.05kg
The Sun has a diameter of 1.392 x 10^6 Km which is about 109 times larger than the Earth. You could fit about 1,300,000 Earths inside the Sun. The Sun is an average sized star. In comparison to the largest star [See related question] our Sun is small in comparison.