129727728

Names of 129727728

• Cardinal: 129727728 can be written as One hundred twenty-nine million, seven hundred twenty-seven thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 1.29727728 × 10⁸

Factors of 129727728

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 172

Divisors of 129727728

• Number of divisors d(n): 180
• Complete list of divisors:
  1 2 3 4 6 8 9 12 13 16 18 23 24 26 36 39 46 48 52 69 72 78 92 104 117 131 138 144 156 184 207 208 234 262 276 299 312 368 393 414 468 524 529 552 598 624 786 828 897 936 1048 1058 1104 1179 1196 1572 1587 1656 1703 1794 1872 2096 2116 2358 2392 2691 3013 3144 3174 3312 3406 3588 4232 4716 4761 4784 5109 5382 6026 6288 6348 6812 6877 7176 8464 9039 9432 9522 10218 10764 12052 12696 13624 13754 14352 15327 18078 18864 19044 20436 20631 21528 24104 25392 27117 27248 27508 30654 36156 38088 39169 40872 41262 43056 48208 54234 55016 61308 61893 69299 72312 76176 78338 81744 82524 108468 110032 117507 122616 123786 138598 144624 156676 165048 207897 216936 235014 245232 247572 277196 313352 330096 352521 415794 433872 470028 495144 554392 623691 626704 705042 831588 900887 940056 990288 1108784 1247382 1410084 1663176 1801774 1880112 2494764 2702661 2820168 3326352 3603548 4989528 5405322 5640336 7207096 8107983 9979056 10810644 14414192 16215966 21621288 32431932 43242576 64863864 129727728
• Sum of all divisors σ(n): 411843432
• Sum of proper divisors (its aliquot sum) s(n): 282115704
• 129727728 is an abundant number, because the sum of its proper divisors (282115704) is greater than itself. Its abundance is 152387976

Bases of 129727728

• Binary: 111101110110111110011110000₂
• Hexadecimal: 0x7BB7CF0
• Base-36: 258IK0

Squares and roots of 129727728

• 129727728 squared (129727728²) is 16829283412041984
• 129727728 cubed (129727728³) is 2183224700912294424932352
• The square root of 129727728 is 11389.8080756437
• The cube root of 129727728 is 506.2257945445

Scales and comparisons

• 129,727,728 seconds is equal to 4 years, 6 weeks, 3 days, 11 hours, 28 minutes, 48 seconds.
• To count from 1 to 129,727,728 would take you about six years!

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 129727728 cubic inches would be around 42.2 feet tall.

Recreational maths with 129727728

• 129727728 backwards is 827727921
• The number of decimal digits it has is: 9
• The sum of 129727728's digits is 45
• More coming soon!