Brilliantia's Population

On planet Brilliantia , exactly $35$ % of the population lives in cities with more than $300 000$ inhabitants :

• The largest city is Brilliantown with exactly $5045040$ inhabitants.

• The second largest city is Brilliantopolis wih half as many inhabitants as Brilliantown.

• The population of the $n$ -th largest city follows exactly the rank-size rule i.e it has $\frac{1}{n}$ -th as many inhabitants as the largest one (rounded to the nearest integer.)

How many people are there on Brilliantia ?

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