27728239 has 24 divisors (see below), whose sum is σ = 36686720. Its totient is φ = 20457360.

The previous prime is 27728231. The next prime is 27728287. The reversal of 27728239 is 93282772.

It is not a de Polignac number, because 27728239 - 2³ = 27728231 is a prime.

It is a super-2 number, since 2×27728239² = 1537710476082242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15232 + ... + 16954.

Almost surely, 2^27728239 is an apocalyptic number.

27728239 is a deficient number, since it is larger than the sum of its proper divisors (8958481).

27728239 is a wasteful number, since it uses less digits than its factorization.

27728239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771 (or 1760 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 27728239 is about 5265.7610086292. The cubic root of 27728239 is about 302.6732891410.

It can be divided in two parts, 2772 and 8239, that added together give a palindrome (11011).

The spelling of 27728239 in words is "twenty-seven million, seven hundred twenty-eight thousand, two hundred thirty-nine".