India is the top country by adult illiteracy in the world. As of 2015, adult illiteracy in India was 259 million number that accounts for 35.33 % of the world's adult illiteracy. The top 5 countries (others are Pakistan, Bangladesh, China, and Nigeria) account for 59.85 % of it. The world's total adult illiteracy was estimated at 734 million number in 2015.
Adult illiterate population. Total is the total number of adults over age 15 who cannot both read and write with understanding a short simple statement on their everyday life.