988666889 has 4 divisors (see below), whose sum is σ = 1129905024. Its totient is φ = 847428756.

The previous prime is 988666873. The next prime is 988666897.

988666889 is nontrivially palindromic in base 10.

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 988666889 - 2⁴ = 988666873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (988666859) 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, 70619057 + ... + 70619070.

It is an arithmetic number, because the mean of its divisors is an integer number (282476256).

Almost surely, 2^988666889 is an apocalyptic number.

It is an amenable number.

988666889 is a deficient number, since it is larger than the sum of its proper divisors (141238135).

988666889 is a wasteful number, since it uses less digits than its factorization.

988666889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141238134.

The product of its digits is 71663616, while the sum is 68.

The square root of 988666889 is about 31443.0737842215. The cubic root of 988666889 is about 996.2079347508.

The spelling of 988666889 in words is "nine hundred eighty-eight million, six hundred sixty-six thousand, eight hundred eighty-nine".