How does python float division work when numerator and denominator are integers and evenly divisible without decimal points?

Question

I tested these calculations

n = 773160767  
n*(n+1)      
n*(n+1)/2
n*(n+1)//2

n*(n+1)/2 % (10**9+7)
n*(n+1)//2 % (10**9+7)

Output: