CREATE TABLE table_70380 ("Rank" FLOAT, "Subdivision name" TEXT, "Country" TEXT, "Area  ( km\\u00b2 ) " FLOAT, "Population" FLOAT)

What's the smallest area in Russia that is ranked 23 with a population more than 522,800?
SELECT MIN("Area (km\u00b2)") FROM table_70380 WHERE "Country" = 'russia' AND "Rank" = '23' AND "Population" > '522,800'
SELECT MIN("Area (km\u00b2)") FROM "table_70380" WHERE "Country" = 'russia' AND "Population" > '522,800' AND "Rank" = '23'