Is $1.5 million enough to retire at 70?

I'm curious to know, given the current state of the economy and the fluctuations in the cryptocurrency market, would $1.5 million be considered a sufficient amount to retire on at the age of 70? Are there any factors I should consider beyond just the dollar amount, such as inflation, the cost of living in my desired retirement location, and potential market downturns? Additionally, how might diversifying my investments, including in cryptocurrency, affect my retirement savings and overall financial stability?