9891000228 has 24 divisors (see below), whose sum is σ = 23641904160. Its totient is φ = 3216585280.

The previous prime is 9891000227. The next prime is 9891000239. The reversal of 9891000228 is 8220001989.

9891000228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9891000227) by changing a digit.

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, 10051338 + ... + 10052321.

It is an arithmetic number, because the mean of its divisors is an integer number (985079340).

Almost surely, 2^9891000228 is an apocalyptic number.

It is an amenable number.

9891000228 is an abundant number, since it is smaller than the sum of its proper divisors (13750903932).

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

9891000228 is a wasteful number, since it uses less digits than its factorization.

9891000228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20103707 (or 20103705 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 9891000228 is about 99453.5078717689. The cubic root of 9891000228 is about 2146.5783127329.

The spelling of 9891000228 in words is "nine billion, eight hundred ninety-one million, two hundred twenty-eight", and thus it is an aban number.