280was the smallest number that didn't have a nBAB on 14 April 2016. MathBabbler is trying to ensure that the numbers 0-300 have nBABs by the end of the Spring 2016 Semester. With the posting of this nBAB for280, 282 became the smallest number without a nBAB on 14 April 2016.MathBabbler Number Analyst (MBNA) output: ========================================= 280 is a natural, whole, integer 280 is even 280 proper divisors are: 1,2,4,5,7,8,10,14,20,28,35,40,56,70,140, 280 has 15 proper divisors 280 is abundant (sum of divisors is 440; ratio: 1.57143) 280 is happy 280 is not a Squarefree Number: 4, 280 is Harshad (Niven) number 280 is composite (not prime) 280 has the prime factors: 2*2*2*5*7 (sum=18) 280 is a 7-smooth number 280 is Arithmetic (A003601) 280 is the sum of 6 consecutive primes 280 = 37 + 41 + 43 + 47 + 53 + 59 280 in octal is 0430 280 in hexadecimal is 0x118 280 in binary is 100011000 (is odious) 280 nearest square numbers: -24...9 (256...289 [17]) sqrt(280) = 16.7332 ln(280) = 5.63479 log(280) = 2.44716 280 reciprocal is .00357142857142857142857142857142 280! is 1.67723e+565 280 is 89.1268 Pi years 280 is 14 scoreyears 280 written as a Roman numeral is CCLXXX 280 is 71^2 - 69^2 and 2 * (71 + 69) 280 is a multiple of 2 & it contains a 2 (A121022) 280 is a multiple of 8 & it contains a 8 (A121028) 280 is a multiple of 28 & it contains a 28log6(

`) = 3.14484, which when rounded to the nearest hundredth (3.14) equals Pi (3.14159265...) rounded to the nearest hundredth.`

280## Update::2017.11.08

Twitter Inc. announced had increased the maximum tweet length from 140 characters to

280characters.

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 14 April 2016

This work is licensed under a Creative Commons Attribution 3.0 United States License.