28495889 has 2 divisors, whose sum is σ = 28495890. Its totient is φ = 28495888.

The previous prime is 28495867. The next prime is 28495891. The reversal of 28495889 is 98859482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17572864 + 10923025 = 4192^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 28495889 - 2⁸ = 28495633 is a prime.

Together with 28495891, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28495889.

It is not a weakly prime, because it can be changed into another prime (28495849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14247944 + 14247945.

It is an arithmetic number, because the mean of its divisors is an integer number (14247945).

Almost surely, 2^28495889 is an apocalyptic number.

It is an amenable number.

28495889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28495889 is an equidigital number, since it uses as much as digits as its factorization.

28495889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 53.

The square root of 28495889 is about 5338.1540817028. The cubic root of 28495889 is about 305.4410496248.

It can be divided in two parts, 2849 and 5889, that multiplied together give a palindrome (16777761).

The spelling of 28495889 in words is "twenty-eight million, four hundred ninety-five thousand, eight hundred eighty-nine".