human
round number to significant figures.
assistant
Here is a Python code to round number to significant figures
import numpy as np

import sys

def round_to_sigfigs(number, sigfigs):
    """Round number to significant figures.

    Args:
        number (float): Number to round.
        sigfigs (int): Number of significant figures.

    Returns:
        float: Rounded number.
    """
    return round(number, -int(np.floor(np.log10(abs(number)))) + sigfigs - 1)

# Enter the number
number = 1234567890.1234567890

# Calling the function
print((round_to_sigfigs(number, 3)))

#Example Output
# 1230000000.0

#Remember to inspect code for bugs.