987888789 has 12 divisors (see below), whose sum is σ = 1465517196. Its totient is φ = 640792512.

The previous prime is 987888761. The next prime is 987888829.

987888789 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 706655889 + 281232900 = 26583^2 + 16770^2 .

It is not a de Polignac number, because 987888789 - 2¹⁷ = 987757717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987888719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1482984 + ... + 1483649.

It is an arithmetic number, because the mean of its divisors is an integer number (122126433).

Almost surely, 2^987888789 is an apocalyptic number.

It is an amenable number.

987888789 is a deficient number, since it is larger than the sum of its proper divisors (477628407).

987888789 is a wasteful number, since it uses less digits than its factorization.

987888789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966676 (or 2966673 counting only the distinct ones).

The product of its digits is 130056192, while the sum is 72.

The square root of 987888789 is about 31430.6981945995. The cubic root of 987888789 is about 995.9465211766.

It can be divided in two parts, 98 and 7888789, that added together give a palindrome (7888887).

The spelling of 987888789 in words is "nine hundred eighty-seven million, eight hundred eighty-eight thousand, seven hundred eighty-nine".