978656 has 48 divisors (see below), whose sum is σ = 2340576. Its totient is φ = 393216.

The previous prime is 978647. The next prime is 978683. The reversal of 978656 is 656879.

It is a happy number.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

978656 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680 + ... + 3936.

It is an arithmetic number, because the mean of its divisors is an integer number (48762).

2⁹⁷⁸⁶⁵⁶ 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 978656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1170288).

978656 is an abundant number, since it is smaller than the sum of its proper divisors (1361920).

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

978656 is a wasteful number, since it uses less digits than its factorization.

978656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 283 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 978656 is about 989.2704382524. The cubic root of 978656 is about 99.2834105952.

The spelling of 978656 in words is "nine hundred seventy-eight thousand, six hundred fifty-six".