27689861 has 8 divisors (see below), whose sum is σ = 29064960. Its totient is φ = 26329072.

The previous prime is 27689839. The next prime is 27689869. The reversal of 27689861 is 16898672.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27689861 - 2¹⁸ = 27427717 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 (27689869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500 + ... + 7458.

It is an arithmetic number, because the mean of its divisors is an integer number (3633120).

Almost surely, 2^27689861 is an apocalyptic number.

It is an amenable number.

27689861 is a deficient number, since it is larger than the sum of its proper divisors (1375099).

27689861 is a wasteful number, since it uses less digits than its factorization.

27689861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155.

The product of its digits is 290304, while the sum is 47.

The square root of 27689861 is about 5262.1156391702. The cubic root of 27689861 is about 302.5335836857.

The spelling of 27689861 in words is "twenty-seven million, six hundred eighty-nine thousand, eight hundred sixty-one".