27782989 has 4 divisors (see below), whose sum is σ = 29920156. Its totient is φ = 25645824.

The previous prime is 27782983. The next prime is 27783013. The reversal of 27782989 is 98928772.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13380964 + 14402025 = 3658^2 + 3795^2 .

It is a cyclic number.

It is not a de Polignac number, because 27782989 - 2⁹ = 27782477 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 (27782983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068564 + ... + 1068589.

It is an arithmetic number, because the mean of its divisors is an integer number (7480039).

Almost surely, 2^27782989 is an apocalyptic number.

It is an amenable number.

27782989 is a deficient number, since it is larger than the sum of its proper divisors (2137167).

27782989 is a wasteful number, since it uses less digits than its factorization.

27782989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137166.

The product of its digits is 1016064, while the sum is 52.

The square root of 27782989 is about 5270.9571237110. The cubic root of 27782989 is about 302.8723697929.

The spelling of 27782989 in words is "twenty-seven million, seven hundred eighty-two thousand, nine hundred eighty-nine".