# Number Gossip

(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)

## Unique Properties of 27

• 27 is the only number which is thrice the sum of its digits
• 27 is the first composite number not divisible by any of its digits
• 27 is the largest number that is the sum of the digits of its cube
• 27 is the only 2-digit number in which the sum of digits is equal to the sum of prime factors (27 = 3 * 3 * 3 and 2 + 7 = 3 + 3 + 3 = 9)
• A 10,000-day-old person is 27 years old
• 27 is the smallest cube out of three known with only prime digits (the other cubes are 3375 and 2775577757352755375573357273)
• A web page about 27: The Mystery of the number 27
• 27 is the smallest evil cube
• 27 is the largest number that equals the sum of numbers between the first and the second digits inclusive
• 27 is the smallest number that have composite sum of digits and prime sum of squares of digits
• 27 is the smallest number n where n and n+1 are both products of 3 primes
• 27 is the smallest number whose reciprocal has period 3