About the Number 85 (eighty-five)

Bettie Page died at the age of 85 on 11 December 2008. MathBabbler's mother is named Betty (actually Elizabeth, but MathBabbler has only known her as Betty).

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   85 is a natural, whole, integer
   85 is odd
   85 proper divisors are: 1,5,17,
   85 is deficient (sum of divisors is 23)
   85 is unhappy
   85 is not a Harshad number
   85 is not prime
   85 is undulating
   85 has the prime factors: 5*17
   85 in octal is 0125
   85 in hexadecimal is 0x55
   85 in binary is 1010101 (is evil)
   85 nearest square numbers: -4...15 (81...100 [10])
   sqrt(85) = 9.21954
   ln(85) = 4.44265
   log(85) = 1.92942
   85 reciprocal is .01176470588235294117647058823529
   85! is 2.8171e+128
   85 is 27.0563 Pi years
   85 is 4 score and 5 years

85 written as a Roman numeral is LXXXV.

85 is a semi-prime (i.e. it has only two prime factors).

85 is a 7th centered square number.

   C(n) = n^2 + (n - 1)^2
   C(7) = 7^2 + (7 - 1)^2 = 7^2 + 6^2 = 49 + 36 = 85

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 12 December 2008 (nBAB# 87)