How many people can fit into the Pentagon which was once the largest office building in the world Assume that everybody must be standing on the floor?

The Pentagon has a total floor area of approximately 6.5 million square feet. If we assume an average standing space of about 2 square feet per person, the building could theoretically accommodate around 3.25 million people standing. However, this is a rough estimate and doesn't account for structural elements, safety regulations, or practical considerations. In reality, the number would be significantly lower.