728128420155

Names of 728128420155

• Cardinal: 728128420155 can be written as Seven hundred twenty-eight billion, one hundred twenty-eight million, four hundred twenty thousand, one hundred fifty-five.

Scientific notation

• Scientific notation: 7.28128420155 × 10¹¹

Factors of 728128420155

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 35177

Divisors of 728128420155

• Number of divisors d(n): 80
• Complete list of divisors:
  1 3 5 9 15 27 45 79 81 135 237 395 405 661 711 1185 1983 2133 3305 3555 5949 6399 9915 10665 17847 29745 31995 34429 52219 53541 89235 103287 156657 172145 261095 267705 309861 469971 516435 783285 929583 1409913 1549305 2349855 2719891 2788749 4229739 4647915 7049565 8159673 13599455 13943745 21148695 22757569 24479019 40798365 68272707 73437057 113787845 122395095 204818121 220311171 341363535 367185285 614454363 1024090605 1101555855 1797847951 1843363089 3072271815 5393543853 8989239755 9216815445 16180631559 26967719265 48541894677 80903157795 145625684031 242709473385 728128420155
• Sum of all divisors σ(n): 1323797692800
• Sum of proper divisors (its aliquot sum) s(n): 595669272645
• 728128420155 is a deficient number, because the sum of its proper divisors (595669272645) is less than itself. Its deficiency is 132459147510

Bases of 728128420155

• Binary: 1010100110000111110101011111100100111011₂
• Hexadecimal: 0xA987D5F93B
• Base-36: 9AHWV0OR

Squares and roots of 728128420155

• 728128420155 squared (728128420155²) is 530170996237416210224025
• 728128420155 cubed (728128420155³) is 386032569902352314449606681875223875
• The square root of 728128420155 is 853304.4123611459
• The cube root of 728128420155 is 8996.4118212985

Scales and comparisons

• 728,128,420,155 seconds is equal to 23,152 years, 12 weeks, 6 hours, 29 minutes, 15 seconds.
• To count from 1 to 728,128,420,155 would take you about forty-six thousand, three hundred four 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 728128420155 cubic inches would be around 749.7 feet tall.

Recreational maths with 728128420155

• 728128420155 backwards is 551024821827
• 728128420155 is a Harshad number.
• The number of decimal digits it has is: 12
• The sum of 728128420155's digits is 45
• More coming soon!