Here is the full breakdown, sorry was 53 million by end of Sep, not 58.
https://academic.oup.com/cid/advance-article/doi/10.1093/cid/ciaa1780/6000389
Results
We estimated that through the end of September, 1 of every 2.5 (95% Uncertainty Interval (UI): 2.0–3.1) hospitalized infections and 1 of every 7.1 (95% UI: 5.8–9.0) non-hospitalized illnesses may have been nationally reported. Applying these multipliers to reported SARS-CoV-2 cases along with data on the prevalence of asymptomatic infection from published systematic reviews, we estimate that 2.4 million hospitalizations, 44.8 million symptomatic illnesses, and 52.9 million total infections may have occurred in the U.S. population from February 27–September 30, 2020.
That was based on 6,891,764 confirmed infections by Sep 30th. We've more than doubled that already and rising quickly.