1128228889 has 4 divisors (see below), whose sum is σ = 1128443940. Its totient is φ = 1128013840.

The previous prime is 1128228887. The next prime is 1128228923. The reversal of 1128228889 is 9888228211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129163225 + 999065664 = 11365^2 + 31608^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128228889 - 2¹ = 1128228887 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128228887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99454 + ... + 110215.

It is an arithmetic number, because the mean of its divisors is an integer number (282110985).

Almost surely, 2^1128228889 is an apocalyptic number.

It is an amenable number.

1128228889 is a deficient number, since it is larger than the sum of its proper divisors (215051).

1128228889 is an equidigital number, since it uses as much as digits as its factorization.

1128228889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215050.

The product of its digits is 294912, while the sum is 49.

The square root of 1128228889 is about 33589.1186100499. The cubic root of 1128228889 is about 1041.0359773641.

The spelling of 1128228889 in words is "one billion, one hundred twenty-eight million, two hundred twenty-eight thousand, eight hundred eighty-nine".