998686868 has 12 divisors (see below), whose sum is σ = 1788346560. Its totient is φ = 487730712.

The previous prime is 998686861. The next prime is 998686921. The reversal of 998686868 is 868686899.

It is a junction number, because it is equal to n+sod(n) for n = 998686798 and 998686807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998686861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2902988 + ... + 2903331.

It is an arithmetic number, because the mean of its divisors is an integer number (149028880).

Almost surely, 2^998686868 is an apocalyptic number.

It is an amenable number.

998686868 is a deficient number, since it is larger than the sum of its proper divisors (789659692).

998686868 is a wasteful number, since it uses less digits than its factorization.

998686868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806366 (or 5806364 counting only the distinct ones).

The product of its digits is 71663616, while the sum is 68.

The square root of 998686868 is about 31602.0073413067. The cubic root of 998686868 is about 999.5620976028.

The spelling of 998686868 in words is "nine hundred ninety-eight million, six hundred eighty-six thousand, eight hundred sixty-eight".