9989667987 has 16 divisors (see below), whose sum is σ = 14363129760. Its totient is φ = 6139348992.

The previous prime is 9989667967. The next prime is 9989668021. The reversal of 9989667987 is 7897669899.

It is a happy number.

It is not a de Polignac number, because 9989667987 - 2⁶ = 9989667923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9989667967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139662 + ... + 198707.

It is an arithmetic number, because the mean of its divisors is an integer number (897695610).

Almost surely, 2^9989667987 is an apocalyptic number.

9989667987 is a deficient number, since it is larger than the sum of its proper divisors (4373461773).

9989667987 is a wasteful number, since it uses less digits than its factorization.

9989667987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339142.

The product of its digits is 740710656, while the sum is 78.

The square root of 9989667987 is about 99948.3265842905. The cubic root of 9989667987 is about 2153.6924461032.

The spelling of 9989667987 in words is "nine billion, nine hundred eighty-nine million, six hundred sixty-seven thousand, nine hundred eighty-seven".