28391440

Names of 28391440

• Cardinal: 28391440 can be written as Twenty-eight million, three hundred ninety-one thousand, four hundred forty.

Scientific notation

• Scientific notation: 2.839144 × 10⁷

Factors of 28391440

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 444

Divisors of 28391440

• Number of divisors d(n): 120
• Complete list of divisors:
  1 2 4 5 7 8 10 11 14 16 20 22 28 35 40 44 55 56 70 77 80 88 110 112 121 140 154 176 220 242 280 308 385 419 440 484 560 605 616 770 838 847 880 968 1210 1232 1540 1676 1694 1936 2095 2420 2933 3080 3352 3388 4190 4235 4609 4840 5866 6160 6704 6776 8380 8470 9218 9680 11732 13552 14665 16760 16940 18436 23045 23464 29330 32263 33520 33880 36872 46090 46928 50699 58660 64526 67760 73744 92180 101398 117320 129052 161315 184360 202796 234640 253495 258104 322630 354893 368720 405592 506990 516208 645260 709786 811184 1013980 1290520 1419572 1774465 2027960 2581040 2839144 3548930 4055920 5678288 7097860 14195720 28391440
• Sum of all divisors σ(n): 83119680
• Sum of proper divisors (its aliquot sum) s(n): 54728240
• 28391440 is an abundant number, because the sum of its proper divisors (54728240) is greater than itself. Its abundance is 26336800

Bases of 28391440

• Binary: 1101100010011100000010000₂
• Hexadecimal: 0x1B13810
• Base-36: GWIZ4

Squares and roots of 28391440

• 28391440 squared (28391440²) is 806073865273600
• 28391440 cubed (28391440³) is 22885597781483497984000
• The square root of 28391440 is 5328.3618495743
• The cube root of 28391440 is 305.0674042551

Scales and comparisons

• 28,391,440 seconds is equal to 46 weeks, 6 days, 14 hours, 30 minutes, 40 seconds.
• To count from 1 to 28,391,440 would take you about eighteen 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 28391440 cubic inches would be around 25.4 feet tall.

Recreational maths with 28391440

• 28391440 backwards is 04419382
• The number of decimal digits it has is: 8
• The sum of 28391440's digits is 31
• More coming soon!