九百万 means 'nine million' in Chinese. The source pinyin 'jiǔ bǎi' appears to be an error or truncation; the actual pronunciation is jiǔ bǎi wàn. It is a numeral used for large numbers, commonly seen in population, financial, or statistical contexts. As a measure word (m) it functions as a quantity specifier (e.g., 九百万人口 'nine million people').