18027627289 has 9 divisors (see below), whose sum is σ = 20972006751. Its totient is φ = 15451446360.

The previous prime is 18027627209. The next prime is 18027627301. The reversal of 18027627289 is 98272672081.

It is a happy number.

The square root of 18027627289 is 134267.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13716391689 + 4311235600 = 117117^2 + 65660^2 .

It is not a de Polignac number, because 18027627289 - 2⁷ = 18027627161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18027627209) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 930279 + ... + 949459.

Almost surely, 2^18027627289 is an apocalyptic number.

18027627289 is the 134267-th square number.

18027627289 is the 67134-th centered octagonal number.

It is an amenable number.

18027627289 is a deficient number, since it is larger than the sum of its proper divisors (2944379462).

18027627289 is an frugal number, since it uses more digits than its factorization.

18027627289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38376 (or 19188 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 18027627289 in words is "eighteen billion, twenty-seven million, six hundred twenty-seven thousand, two hundred eighty-nine".