978772656 has 80 divisors (see below), whose sum is σ = 2571264000. Its totient is φ = 320788224.

The previous prime is 978772643. The next prime is 978772693. The reversal of 978772656 is 656277879.

978772656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 978772596 and 978772605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 764625 + ... + 765903.

It is an arithmetic number, because the mean of its divisors is an integer number (32140800).

Almost surely, 2^978772656 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 978772656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285632000).

978772656 is an abundant number, since it is smaller than the sum of its proper divisors (1592491344).

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

978772656 is a wasteful number, since it uses less digits than its factorization.

978772656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546 (or 1540 counting only the distinct ones).

The product of its digits is 8890560, while the sum is 57.

The square root of 978772656 is about 31285.3425105112. The cubic root of 978772656 is about 992.8735530625.

The spelling of 978772656 in words is "nine hundred seventy-eight million, seven hundred seventy-two thousand, six hundred fifty-six".