8991128 has 32 divisors (see below), whose sum is σ = 17582400. Its totient is φ = 4306848.

The previous prime is 8991127. The next prime is 8991139. The reversal of 8991128 is 8211998.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 8991091 and 8991100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20075 + ... + 20517.

It is an arithmetic number, because the mean of its divisors is an integer number (549450).

Almost surely, 2^8991128 is an apocalyptic number.

It is an amenable number.

8991128 is a deficient number, since it is larger than the sum of its proper divisors (8591272).

8991128 is a wasteful number, since it uses less digits than its factorization.

8991128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 547 counting only the distinct ones).

The product of its digits is 10368, while the sum is 38.

The square root of 8991128 is about 2998.5209687444. The cubic root of 8991128 is about 207.9400098200.

It can be divided in two parts, 8991 and 128, that added together give a palindrome (9119).

The spelling of 8991128 in words is "eight million, nine hundred ninety-one thousand, one hundred twenty-eight".