128728451520

Names of 128728451520

• Cardinal: 128728451520 can be written as One hundred twenty-eight billion, seven hundred twenty-eight million, four hundred fifty-one thousand, five hundred twenty.

Scientific notation

• Scientific notation: 1.2872845152 × 10¹¹

Factors of 128728451520

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 44697389

Divisors of 128728451520

• Number of divisors d(n): 84
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 32 36 40 45 48 60 64 72 80 90 96 120 144 160 180 192 240 288 320 360 480 576 720 960 1440 2880 44697379 89394758 134092137 178789516 223486895 268184274 357579032 402276411 446973790 536368548 670460685 715158064 804552822 893947580 1072737096 1340921370 1430316128 1609105644 1787895160 2011382055 2145474192 2681842740 2860632256 3218211288 3575790320 4022764110 4290948384 5363685480 6436422576 7151580640 8045528220 8581896768 10727370960 12872845152 14303161280 16091056440 21454741920 25745690304 32182112880 42909483840 64364225760 128728451520
• Sum of all divisors σ(n): 442772246280
• Sum of proper divisors (its aliquot sum) s(n): 314043794760
• 128728451520 is an abundant number, because the sum of its proper divisors (314043794760) is greater than itself. Its abundance is 185315343240

Bases of 128728451520

• Binary: 1110111111000110100000100100111000000₂
• Hexadecimal: 0x1DF8D049C0
• Base-36: 1N4XLGW0

Squares and roots of 128728451520

• 128728451520 squared (128728451520²) is 16571014230736990310400
• 128728451520 cubed (128728451520³) is 2133161002038656751043036151808000
• The square root of 128728451520 is 358787.4740288463
• The cube root of 128728451520 is 5049.2264477987

Scales and comparisons

• 128,728,451,520 seconds is equal to 4,093 years, 8 weeks, 4 days, 15 hours, 12 minutes.
• To count from 1 to 128,728,451,520 would take you about eight thousand, one hundred eighty-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 128728451520 cubic inches would be around 420.8 feet tall.

Recreational maths with 128728451520

• 128728451520 backwards is 025154827821
• 128728451520 is a Harshad number.
• The number of decimal digits it has is: 12
• The sum of 128728451520's digits is 45
• More coming soon!