9978606 has 64 divisors (see below), whose sum is σ = 24572160. Its totient is φ = 2976480.

The previous prime is 9978601. The next prime is 9978607. The reversal of 9978606 is 6068799.

9978606 = 170² + 171² + ... + 326².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978601) 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 31 ways as a sum of consecutive naturals, for example, 63480 + ... + 63636.

It is an arithmetic number, because the mean of its divisors is an integer number (383940).

Almost surely, 2^9978606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9978606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12286080).

9978606 is an abundant number, since it is smaller than the sum of its proper divisors (14593554).

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

9978606 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (9978605) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (286).

9978606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 9978606 is about 3158.8931605865. The cubic root of 9978606 is about 215.2897193878.

The spelling of 9978606 in words is "nine million, nine hundred seventy-eight thousand, six hundred six".