MathBabbler decided to create a nBAB for the number 90 because this is the 90th nBAB.

MathBabbler Number Analyst (MBNA) output: ========================================= 90 is a natural, whole, integer 90 is even 90 proper divisors are: 1,2,3,5,6,9,10,15,18,30,45, 90 is abundant (sum of divisors is 144) 90 is unhappy 90 is a Harshad number 90 is not prime 90 is undulating 90 has the prime factors: 2*3*3*5 90 in octal is 0132 90 in hexadecimal is 0x5a 90 in binary is 1011010 (is evil) 90 nearest square numbers: -9...10 (81...100 [10]) sqrt(90) = 9.48683 ln(90) = 4.49981 log(90) = 1.95424 90 reciprocal is .01111111111111111111111111111111 90! is 1.48572e+138 90 is 28.6479 Pi years 90 is 4 score and 10 years

`written as a Roman numeral is`

90`.`

XC

`equals the sum of the squares of the numbers two through six.`

902^2 + 3^2 + 4^2 + 5^2 + 6^2 = 4 + 9 + 16 + 25 + 36 =90An angle measuring

`degrees minus Pi divided-by two radians is zero.`

90## Update::2009.01.02

Claiborne Pell died at the age of

`on 1 January 2009. In 1972, Pell sponsored program (Pell grants) that has "helped 54 million low- and moderate-income students attend college."`

90## Update::2009.03.01

Paul Harvey, a resident of Phoenix, Arizona, died at the age of

`on 28 February 2009. MathBabbler says "Page 2" from time-to-time during class.`

90## Update::2013.12.14

Pi Day 2014 was

`days away on 14 December 2013.`

90

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

**Created:** 17 December 2008 (nBAB #90)

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