28121280

Names of 28121280

• Cardinal: 28121280 can be written as Twenty-eight million, one hundred twenty-one thousand, two hundred eighty.

Scientific notation

• Scientific notation: 2.812128 × 10⁷

Factors of 28121280

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 2684

Divisors of 28121280

• Number of divisors d(n): 112
• Complete list of divisors:
  1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 30 32 33 40 44 48 55 60 64 66 80 88 96 110 120 132 160 165 176 192 220 240 264 320 330 352 440 480 528 660 704 880 960 1056 1320 1760 2112 2640 2663 3520 5280 5326 7989 10560 10652 13315 15978 21304 26630 29293 31956 39945 42608 53260 58586 63912 79890 85216 87879 106520 117172 127824 146465 159780 170432 175758 213040 234344 255648 292930 319560 351516 426080 439395 468688 511296 585860 639120 703032 852160 878790 937376 1171720 1278240 1406064 1757580 1874752 2343440 2556480 2812128 3515160 4686880 5624256 7030320 9373760 14060640 28121280
• Sum of all divisors σ(n): 97438464
• Sum of proper divisors (its aliquot sum) s(n): 69317184
• 28121280 is an abundant number, because the sum of its proper divisors (69317184) is greater than itself. Its abundance is 41195904

Bases of 28121280

• Binary: 1101011010001100011000000₂
• Hexadecimal: 0x1AD18C0
• Base-36: GQQIO

Squares and roots of 28121280

• 28121280 squared (28121280²) is 790806388838400
• 28121280 cubed (28121280³) is 22238487886313521152000
• The square root of 28121280 is 5302.9501223375
• The cube root of 28121280 is 304.0966913111

Scales and comparisons

• 28,121,280 seconds is equal to 46 weeks, 3 days, 11 hours, 28 minutes.
• To count from 1 to 28,121,280 would take you about seventeen weeks!

  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 28121280 cubic inches would be around 25.3 feet tall.

Recreational maths with 28121280

• 28121280 backwards is 08212182
• 28121280 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 28121280's digits is 24
• More coming soon!