27439661 has 4 divisors (see below), whose sum is σ = 27904800. Its totient is φ = 26974524.

The previous prime is 27439639. The next prime is 27439663. The reversal of 27439661 is 16693472.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27439661 - 2¹⁰ = 27438637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27439663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232481 + ... + 232598.

It is an arithmetic number, because the mean of its divisors is an integer number (6976200).

Almost surely, 2^27439661 is an apocalyptic number.

It is an amenable number.

27439661 is a deficient number, since it is larger than the sum of its proper divisors (465139).

27439661 is an equidigital number, since it uses as much as digits as its factorization.

27439661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465138.

The product of its digits is 54432, while the sum is 38.

The square root of 27439661 is about 5238.2879836832. The cubic root of 27439661 is about 301.6196145018.

The spelling of 27439661 in words is "twenty-seven million, four hundred thirty-nine thousand, six hundred sixty-one".