<human>:  Python code to 3 rounding or floats.
<bot>: Here is a Python code to 3 rounding or floats

import math

def round_to_3_decimals(number):
  """Round a number to 3 decimals."""
  return round(number, 3)

# Enter the number
number = 1234567890123456789012345678901234567890

# Calling the function
print((round_to_3_decimals(number)))

#Example Output
# 1234567890123456789012345678901234567890

#Remember to inspect code for bugs.