28139940

Names of 28139940

• Cardinal: 28139940 can be written as Twenty-eight million, one hundred thirty-nine thousand, nine hundred forty.

Scientific notation

• Scientific notation: 2.813994 × 10⁷

Factors of 28139940

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 82

Divisors of 28139940

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 18 20 27 30 31 36 41 45 54 60 62 82 90 93 108 123 124 135 155 164 180 186 205 246 270 279 310 369 372 410 465 492 540 558 615 620 738 820 837 930 1107 1116 1230 1271 1395 1476 1674 1681 1845 1860 2214 2460 2542 2790 3348 3362 3690 3813 4185 4428 5043 5084 5535 5580 6355 6724 7380 7626 8370 8405 10086 11070 11439 12710 15129 15252 16740 16810 19065 20172 22140 22878 25215 25420 30258 33620 34317 38130 45387 45756 50430 52111 57195 60516 68634 75645 76260 90774 100860 104222 114390 137268 151290 156333 171585 181548 208444 226935 228780 260555 302580 312666 343170 453870 468999 521110 625332 686340 781665 907740 937998 1042220 1406997 1563330 1875996 2344995 2813994 3126660 4689990 5627988 7034985 9379980 14069970 28139940
• Sum of all divisors σ(n): 92628480
• Sum of proper divisors (its aliquot sum) s(n): 64488540
• 28139940 is an abundant number, because the sum of its proper divisors (64488540) is greater than itself. Its abundance is 36348600

Bases of 28139940

• Binary: 1101011010110000110100100₂
• Hexadecimal: 0x1AD61A4
• Base-36: GR4X0

Squares and roots of 28139940

• 28139940 squared (28139940²) is 791856223203600
• 28139940 cubed (28139940³) is 22282786609575911784000
• The square root of 28139940 is 5304.7092286005
• The cube root of 28139940 is 304.1639380085

Scales and comparisons

• 28,139,940 seconds is equal to 46 weeks, 3 days, 16 hours, 39 minutes.
• To count from 1 to 28,139,940 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 28139940 cubic inches would be around 25.3 feet tall.

Recreational maths with 28139940

• 28139940 backwards is 04993182
• 28139940 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 28139940's digits is 36
• More coming soon!