The health ministry in New Delhi said 697,358 cases had now been recorded, a rise of 24,000 in 24 hours. Russia has just over 681,000.
The United States and Brazil have the highest numbers of cases, but India's tally is not expected to peak for several more weeks and experts predict that the figure of one million infections will be passed this month.
India has registered 19,963 deaths from the virus, a much lower number than many other badly hit countries.
An urban tragedy
India's major cities have been worst hit by the pandemic. New Delhi and Mumbai each have about 100,000 cases, with 3,000 dead in the capital and nearly 5,000 in Mumbai.
New Delhi has opened a new 10,000-bed temporary virus hospital while other cities are tightening restrictions on movement to head off a new surge in cases.
The south-western Kerala state capital, Thiruvananthapuram imposed a new lockdown from Monday with public transport suspended and pharmacies the only businesses allowed to open. The clampdown came after hundreds of new cases were reported across the state, which had been praised for its action to curtail the pandemic.
