9990656 has 80 divisors (see below), whose sum is σ = 22915200. Its totient is φ = 4313088.

The previous prime is 9990653. The next prime is 9990661. The reversal of 9990656 is 6560999.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990653) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 126425 + ... + 126503.

It is an arithmetic number, because the mean of its divisors is an integer number (286440).

Almost surely, 2^9990656 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 9990656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11457600).

9990656 is an abundant number, since it is smaller than the sum of its proper divisors (12924544).

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

9990656 is a wasteful number, since it uses less digits than its factorization.

9990656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 9990656 is about 3160.7998987598. The cubic root of 9990656 is about 215.3763446327.

The spelling of 9990656 in words is "nine million, nine hundred ninety thousand, six hundred fifty-six".