978809712 has 80 divisors (see below), whose sum is σ = 2654830080. Its totient is φ = 310157056.

The previous prime is 978809659. The next prime is 978809759. The reversal of 978809712 is 217908879.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181714 + ... + 187022.

It is an arithmetic number, because the mean of its divisors is an integer number (33185376).

Almost surely, 2^978809712 is an apocalyptic number.

978809712 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 978809712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1327415040).

978809712 is an abundant number, since it is smaller than the sum of its proper divisors (1676020368).

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

978809712 is a wasteful number, since it uses less digits than its factorization.

978809712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5510 (or 5504 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 51.

The square root of 978809712 is about 31285.9347311216. The cubic root of 978809712 is about 992.8860828561.

The spelling of 978809712 in words is "nine hundred seventy-eight million, eight hundred nine thousand, seven hundred twelve".