In the state of Indiana, 283250 people have no political party affiliation. If this is 5.5% of the population of Indiana residents aged 5 years and older,

In the state of Indiana, 283250 people have no political party affiliation. If this is 5.5% of the population of Indiana residents aged 5 years and older, estimate the population of Indiana residents aged 5 years and older. 
Express your answer rounded to the nearest hundredth of a million.