28141889 has 4 divisors (see below), whose sum is σ = 28458180. Its totient is φ = 27825600.

The previous prime is 28141873. The next prime is 28141901. The reversal of 28141889 is 98814182.

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 17850625 + 10291264 = 4225^2 + 3208^2 .

It is a cyclic number.

It is not a de Polignac number, because 28141889 - 2⁴ = 28141873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28141819) 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, 158012 + ... + 158189.

It is an arithmetic number, because the mean of its divisors is an integer number (7114545).

Almost surely, 2^28141889 is an apocalyptic number.

It is an amenable number.

28141889 is a deficient number, since it is larger than the sum of its proper divisors (316291).

28141889 is an equidigital number, since it uses as much as digits as its factorization.

28141889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316290.

The product of its digits is 36864, while the sum is 41.

The square root of 28141889 is about 5304.8929301165. The cubic root of 28141889 is about 304.1709600778.

The spelling of 28141889 in words is "twenty-eight million, one hundred forty-one thousand, eight hundred eighty-nine".