9987556 has 24 divisors (see below), whose sum is σ = 17992800. Its totient is φ = 4849152.

The previous prime is 9987553. The next prime is 9987569. The reversal of 9987556 is 6557899.

It is not an unprimeable number, because it can be changed into a prime (9987553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22020 + ... + 22468.

It is an arithmetic number, because the mean of its divisors is an integer number (749700).

Almost surely, 2^9987556 is an apocalyptic number.

It is an amenable number.

9987556 is a deficient number, since it is larger than the sum of its proper divisors (8005244).

9987556 is a wasteful number, since it uses less digits than its factorization.

9987556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603 (or 601 counting only the distinct ones).

The product of its digits is 680400, while the sum is 49.

The square root of 9987556 is about 3160.3094785163. The cubic root of 9987556 is about 215.3540659576.

The spelling of 9987556 in words is "nine million, nine hundred eighty-seven thousand, five hundred fifty-six".