987666789 has 48 divisors (see below), whose sum is σ = 1434495744. Its totient is φ = 603711360.

The previous prime is 987666773. The next prime is 987666791.

It is a happy number.

987666789 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 987666789 - 2⁴ = 987666773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987666709) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5013439 + ... + 5013635.

It is an arithmetic number, because the mean of its divisors is an integer number (29885328).

Almost surely, 2^987666789 is an apocalyptic number.

It is an amenable number.

987666789 is a deficient number, since it is larger than the sum of its proper divisors (446828955).

987666789 is a wasteful number, since it uses less digits than its factorization.

987666789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 315 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 66.

The square root of 987666789 is about 31427.1664169712. The cubic root of 987666789 is about 995.8719120052.

The spelling of 987666789 in words is "nine hundred eighty-seven million, six hundred sixty-six thousand, seven hundred eighty-nine".