9887887889 has 4 divisors (see below), whose sum is σ = 10786786800. Its totient is φ = 8988988980.

The previous prime is 9887887847. The next prime is 9887887897.

It is a happy number.

9887887889 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 a de Polignac number, because none of the positive numbers 2^k-9887887889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9887887819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449449439 + ... + 449449460.

It is an arithmetic number, because the mean of its divisors is an integer number (2696696700).

Almost surely, 2^9887887889 is an apocalyptic number.

It is an amenable number.

9887887889 is a deficient number, since it is larger than the sum of its proper divisors (898898911).

9887887889 is a wasteful number, since it uses less digits than its factorization.

9887887889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898898910.

The product of its digits is 1040449536, while the sum is 80.

The square root of 9887887889 is about 99437.8594349255. The cubic root of 9887887889 is about 2146.3531390022.

The spelling of 9887887889 in words is "nine billion, eight hundred eighty-seven million, eight hundred eighty-seven thousand, eight hundred eighty-nine".