9729678858 has 16 divisors (see below), whose sum is σ = 19460364096. Its totient is φ = 3243058560.

The previous prime is 9729678823. The next prime is 9729678863. The reversal of 9729678858 is 8588769279.

9729678858 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 = 9729678792 and 9729678801.

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 7 ways as a sum of consecutive naturals, for example, 154635 + ... + 208257.

It is an arithmetic number, because the mean of its divisors is an integer number (1216272756).

Almost surely, 2^9729678858 is an apocalyptic number.

9729678858 is an abundant number, since it is smaller than the sum of its proper divisors (9730685238).

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

9729678858 is a wasteful number, since it uses less digits than its factorization.

9729678858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83869.

The product of its digits is 121927680, while the sum is 69.

The square root of 9729678858 is about 98639.1345156678. The cubic root of 9729678858 is about 2134.8441152980.

The spelling of 9729678858 in words is "nine billion, seven hundred twenty-nine million, six hundred seventy-eight thousand, eight hundred fifty-eight".