Here's a short story:

600 (six hundred) is the natural number following 599 and preceding 601. 

Six hundred is a composite number, an abundant number, a pronic number and a Harshad number. 

601 prime number, centered pentagonal number 602 = 2 × 7 × 43, nontotient, area code for Phoenix, AZ along with 480 and 623 603 = 3 × 67, Harshad number, area code for New Hampshire 604 = 2 × 151, nontotient, totient sum for first 44 integers, area code for southwestern British Columbia (Lower Mainland, Fraser Valley, Sunshine Coast and Sea to Sky) 605 = 5 × 11, Harshad number 606 = 2 × 3 × 101, sphenic number, sum of six consecutive primes (89 + 97 + 101 + 103 + 107 + 109) 607 prime number, sum of three consecutive primes (197 + 199 + 211), Mertens function(607) = 0, balanced prime, strictly non-palindromic number 608 = 2 × 19, Mertens function(608) = 0, nontotient, happy number 609 = 3 × 7 × 29, sphenic number 

610 = 2 × 5 × 61, sphenic number, nontotient, Fibonacci number, Markov number. Also a kind of telephone wall socket used in Australia. 611 = 13 × 47 612 = 2 × 3 × 17, Harshad number, area code for Minneapolis, MN 613 = Primes: prime number, first number of prime triple ("p", "p" + 4, "p" + 6), middle number of sexy prime triple ("p" − 6, "p", "p" + 6). Geometrical numbers: Centered square number with 18 per side, circular number of 21 with a square grid and 27 using a triangular grid. Also 17-gonal. Hypotenuse of a right triangle with integral sides, these being 35 and 612. Partitioning: 613 partitions of 47 into non-factor primes, 613 non-squashing partitions into distinct parts of the number 54. Squares: Sum of squares of two consecutive integers, 17 and 18. Additional properties: a lucky number. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What prime number is mentioned here?
Guess: 601

Question: What comes after 599 when counting up?
Guess: 600

Question: What is 2 x 5 x 61?
Guess: 610

Question: Is it a sphenic number?
Guess: 606

Question: What number is a type of phone wall socket in Australia?
Guess: 610

Question: Can you name a Fibonacci number?
Guess: 610

Question: Is that also a Markov number?
Guess: yes

Question: What's an area code in Minneapolis?
Guess: 61

Question: How about for Phoenix?
Guess: 601

Question: Another Phoenix?
Guess: 480

Question: What is the middle number of sexy prime triple?
Guess: 613

Question: Hypotenuse of a right triangle with integral sides, these being 35 and 612?
Guess: unknown

Question: What's an example of a Harshad number?
Guess: 603

Question: What's an area code for SW British Columbia?
Guess: 604

Question: Does that include the Lower Mainland?
Guess: yes

Question: How about Sea to Sky?
Guess: yes

Question: Sunshine Coast?
Guess: yes

Now answer the following question in the same format.

Question: 3 x 7 x 29?

609