28345789189 has 4 divisors (see below), whose sum is σ = 28451164140. Its totient is φ = 28240414240.

The previous prime is 28345789187. The next prime is 28345789193. The reversal of 28345789189 is 98198754382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98198754382 = 2 ⋅49099377191.

It can be written as a sum of positive squares in 2 ways, for example, as 6214168900 + 22131620289 = 78830^2 + 148767^2 .

It is a cyclic number.

It is not a de Polignac number, because 28345789189 - 2¹ = 28345789187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28345789189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28345789187) 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, 52687072 + ... + 52687609.

It is an arithmetic number, because the mean of its divisors is an integer number (7112791035).

Almost surely, 2^28345789189 is an apocalyptic number.

It is an amenable number.

28345789189 is a deficient number, since it is larger than the sum of its proper divisors (105374951).

28345789189 is a wasteful number, since it uses less digits than its factorization.

28345789189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105374950.

The product of its digits is 34836480, while the sum is 64.

The spelling of 28345789189 in words is "twenty-eight billion, three hundred forty-five million, seven hundred eighty-nine thousand, one hundred eighty-nine".