### About the Number 77 (seventy-seven)

On 27 March 2009 the DJIA closed at 7776.18, which prompted MathBabbler to create a nBAB for the number 7777. After posting the nBAB for 7777, MathBabbler observed that he had nBABs for 7 and 7777, but he did not nBABs for 777 and `77`.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
77 is a natural, whole, integer
77 is odd
77 proper divisors are: 1,7,11,
77 is deficient (sum of divisors is 19)
77 is unhappy
77 is not a Harshad number
77 is not prime
77 is undulating
77 has the prime factors: 7*11
77 is semiprime (biprime or 2-almost prime)
77 in octal is 0115
77 in binary is 1001101 (is evil)
77 nearest square numbers: -13...4 (64...81 [9])
sqrt(77) = 8.77496
ln(77) = 4.34381
log(77) = 1.88649
77 reciprocal is .01298701298701298701298701298701
77! is 1.45183e+113
77 is 24.5099 Pi years
77 is 3 score and 17 years
77 written as a Roman numeral is LXXVII
```

`77` is a palindromic number. [Note: On 29 March 2009 the MBNA only checked prime numbers to see if they were palindromic.]

##### Update::2009.08.26

Edward "Ted" Kennedy died on 25 August 2009 at the age of `77`.

`77` is a repdigit number.

`77` is a ThurmNumber because it is 3 score 17 and both the 3 and the 17 are prime numbers.

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 29 March 2009