27704 is a member of OEIS A171639: sum of n-th nonprime number and n-th noncomposite number, here n = 2722 and 27704 = 3171 + 24533. See Bespoken for Sequences entry.

27704 is a tau number, because it is divisible by the number of its divisors (8).

27704 forms the last number in a run of five consecutive iban numbers: 27000, 27001, 27002, 27003, 27004. These are numbers that when written out do not contain the letter "i" e.g. "twenty seven thousand seven hundred four". See my blog post titled Iban Numbers from July 2023.

27704 can be rendered as a digit equation as follows:

2 * ( 7 - 7 ) = 0 * 4