9987888 has 80 divisors (see below), whose sum is σ = 27498240. Its totient is φ = 3117312.

The previous prime is 9987881. The next prime is 9987889. The reversal of 9987888 is 8887899.

It is not an unprimeable number, because it can be changed into a prime (9987881) 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, 91578 + ... + 91686.

It is an arithmetic number, because the mean of its divisors is an integer number (343728).

Almost surely, 2^9987888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9987888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13749120).

9987888 is an abundant number, since it is smaller than the sum of its proper divisors (17510352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9987888 is a wasteful number, since it uses less digits than its factorization.

9987888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 220 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 57.

The square root of 9987888 is about 3160.3620045811. The cubic root of 9987888 is about 215.3564521522.

The spelling of 9987888 in words is "nine million, nine hundred eighty-seven thousand, eight hundred eighty-eight".