978705680 has 20 divisors (see below), whose sum is σ = 2275490892. Its totient is φ = 391482240.

The previous prime is 978705667. The next prime is 978705703. The reversal of 978705680 is 86507879.

It is a happy number.

978705680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149035264 + 829670416 = 12208^2 + 28804^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6116831 + ... + 6116990.

Almost surely, 2^978705680 is an apocalyptic number.

It is an amenable number.

978705680 is an abundant number, since it is smaller than the sum of its proper divisors (1296785212).

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

978705680 is a wasteful number, since it uses less digits than its factorization.

978705680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12233834 (or 12233828 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 978705680 is about 31284.2720867851. The cubic root of 978705680 is about 992.8509055779.

The spelling of 978705680 in words is "nine hundred seventy-eight million, seven hundred five thousand, six hundred eighty".