While it sounds like a large number, it’s only about 1/3 the population of humans alive today.
Now think about that from the standpoint of evolutionary theory. Supposedly these would have evolved from something else substantially different, and that process would have involved only a fraction of that population. The problem is that there are not nearly enough mutational resources in such limited populations for natural selection to work with to lead to substantial innovations. (If there were we’d be seeing some really interesting new life forms simply from the current generation of humans, for example.)
The problem gets even worse considering very small populations like many whales, which supposedly evolved very substantially over time. If I were still an evolutionist it’s the sort of thing that would keep me awake at night.
Chance mutation cannot explain what we see in the evolutionary record. Something is driving it.
For an animal that was more than 50 times the mass of an average human.