9887988 has 48 divisors (see below), whose sum is σ = 25373376. Its totient is φ = 2972160.

The previous prime is 9887971. The next prime is 9887993. The reversal of 9887988 is 8897889.

9887988 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22620 + ... + 23052.

It is an arithmetic number, because the mean of its divisors is an integer number (528612).

Almost surely, 2^9887988 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 9887988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12686688).

9887988 is an abundant number, since it is smaller than the sum of its proper divisors (15485388).

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

9887988 is a wasteful number, since it uses less digits than its factorization.

9887988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 622 counting only the distinct ones).

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

The square root of 9887988 is about 3144.5171330428. The cubic root of 9887988 is about 214.6360382640.

Subtracting from 9887988 its reverse (8897889), we obtain a palindrome (990099).

The spelling of 9887988 in words is "nine million, eight hundred eighty-seven thousand, nine hundred eighty-eight".