Jain scriptures do not give any exact number for the human population in the time of Bhagwan Ādināth (Rishabhdev).

What we can say from Jain granths is:

• Ādināth Bhagwan was born in the very early part of the current time-cycle (avasarpinī), when:

- Human height, age and strength were much greater than today. - People lived for many lakhs of years.

• He ruled over a very large kingdom (Bharat Kshetra), with countless subjects (anant, asankhyeya) – this means “innumerable”, not a fixed number like we use in modern population statistics.
• Jain texts focus on dharma, conduct, and spiritual progress, not on historical-demographic details like exact population count.

So, according to authentic Jain view:

• We do not know the exact population in Ādināth Bhagwan’s time.
• Any specific number (like “so many millions or billions”) would be speculation, not based on Jain scriptures.