9978688 has 28 divisors (see below), whose sum is σ = 20665440. Its totient is φ = 4771712.

The previous prime is 9978659. The next prime is 9978719. The reversal of 9978688 is 8868799.

Its product of digits (1741824) is a multiple of the sum of its prime divisors (6804).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1918 + ... + 4861.

Almost surely, 2^9978688 is an apocalyptic number.

It is an amenable number.

9978688 is an abundant number, since it is smaller than the sum of its proper divisors (10686752).

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

9978688 is a wasteful number, since it uses less digits than its factorization.

9978688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6814 (or 6804 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 55.

The square root of 9978688 is about 3158.9061397895. The cubic root of 9978688 is about 215.2903091064.

It can be divided in two parts, 99 and 78688, that added together give a palindrome (78787).

The spelling of 9978688 in words is "nine million, nine hundred seventy-eight thousand, six hundred eighty-eight".