9809798856 has 64 divisors (see below), whose sum is σ = 28812006720. Its totient is φ = 2743998720.

The previous prime is 9809798837. The next prime is 9809798861. The reversal of 9809798856 is 6588979089.

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, 1425735 + ... + 1432598.

It is an arithmetic number, because the mean of its divisors is an integer number (450187605).

Almost surely, 2^9809798856 is an apocalyptic number.

It is an amenable number.

9809798856 is an abundant number, since it is smaller than the sum of its proper divisors (19002207864).

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

9809798856 is a wasteful number, since it uses less digits than its factorization.

9809798856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858366 (or 2858362 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 69.

The square root of 9809798856 is about 99044.4286974285. The cubic root of 9809798856 is about 2140.6879652599.

The spelling of 9809798856 in words is "nine billion, eight hundred nine million, seven hundred ninety-eight thousand, eight hundred fifty-six".