270,000

[EECS]   270K(W) is one of standard numerical values for resistors (of tolerance class 5%).

[Math.]   Sum (in degrees) of all internal angles of a 1502-side polygon.

271,443

[Math.]   The 26th Lucas number.

273,529

[Math.]   273,529 = (–2–7+3+529)2 = 5232.

274,177

[Math.]   A prime factor of the Fermat number: (1+2^(26)) = 274177×67,280,421,310,721. Fermat number is a number of the form (1+2^(2n)).

274,924 & 275,444

[Math.]  The 2nd known amicable/sociable number chain: 14316 → 19116 → 31704 → 47616 → 83328 → 177792 → 295488 → 629072 → 589786 → 294896 → 358336 → 418904 → 366556 → 274924 → 275444 → 243760 → 376736 → 381028 → 285778 → 152990 → 122410 → 97946 → 48976 → 45946 → 22976 → 22744 → 19916 → 17716 → 14316. (of 28 links, currently the longest, found by P. Poulet, 1918)

278,545

[Math.]   A Carmichael number: 278,545 = 5×17×29×113.

278,784

[Math.]   Sum of the first 32 cube numbers:

13+23+…+313+323 = 278,784 = (1+2+…+31+32)2 = 5282.

279,972

[Math.]

7,683,984 = 1584×4851 = 27722

782432784 = 15984×48951 = 279722

78384320784 = 159984×489951 = 2799722

7839843200784 = 1599984×4899951 = 27999722

783998432000784 = 15999984×48999951 = 279999722

7839…9984320000784 = 159…999984×489…999951 = 279…9999722

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