27123689 has 4 divisors (see below), whose sum is σ = 27290256. Its totient is φ = 26957124.

The previous prime is 27123683. The next prime is 27123703. The reversal of 27123689 is 98632172.

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 a de Polignac number, because none of the positive numbers 2^k-27123689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27123683) 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, 83039 + ... + 83364.

It is an arithmetic number, because the mean of its divisors is an integer number (6822564).

Almost surely, 2^27123689 is an apocalyptic number.

It is an amenable number.

27123689 is a deficient number, since it is larger than the sum of its proper divisors (166567).

27123689 is a wasteful number, since it uses less digits than its factorization.

27123689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166566.

The product of its digits is 36288, while the sum is 38.

The square root of 27123689 is about 5208.0408024515. The cubic root of 27123689 is about 300.4574096410.

The spelling of 27123689 in words is "twenty-seven million, one hundred twenty-three thousand, six hundred eighty-nine".