### About the Number 2647 (two thousand six hundred forty-seven)

This nBAB for the number `2647` was the last BAB posted in 2009 and it was BAB# `2647`.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
2647 is a natural, whole, integer
2647 is odd
2647 proper divisors are: 1,
2647 is deficient (sum of divisors is 1)
2647 is unhappy
2647 is not a Harshad number
2647 is prime
...OEIS:002145 (4n+3; n=661)
...Super
...Left-truncatable
2647 is a lucky number
2647 is the sum of 29 consecutive primes
29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67 + 71 +
73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113 +
127 + 131 + 137 + 139 + 149 + 151 + 157 + 163
2647 in octal is 05127
2647 in binary is 101001010111 (is odious)
2647 nearest square numbers: -46...57 (2601...2704 [52])
sqrt(2647) = 51.449
ln(2647) = 7.88118
log(2647) = 3.42275
2647 reciprocal is .00037778617302606724593879863996
2647! is inf
2647 is 842.566 Pi years
2647 is 132 score and 7 years
2647 written as a Roman numeral is MMDCXLVII
```

`2647` = 1324^2 - 1323^2 and 1324 + 1323 = `2647`.

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 31 December 2009