28326889 has 2 divisors, whose sum is σ = 28326890. Its totient is φ = 28326888.

The previous prime is 28326887. The next prime is 28326911. The reversal of 28326889 is 98862382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27825625 + 501264 = 5275^2 + 708^2 .

It is a cyclic number.

It is not a de Polignac number, because 28326889 - 2¹ = 28326887 is a prime.

Together with 28326887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28326887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14163444 + 14163445.

It is an arithmetic number, because the mean of its divisors is an integer number (14163445).

Almost surely, 2^28326889 is an apocalyptic number.

It is an amenable number.

28326889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28326889 is an equidigital number, since it uses as much as digits as its factorization.

28326889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 46.

The square root of 28326889 is about 5322.3011000882. The cubic root of 28326889 is about 304.8360276014.

It can be divided in two parts, 283 and 26889, that added together give a palindrome (27172).

The spelling of 28326889 in words is "twenty-eight million, three hundred twenty-six thousand, eight hundred eighty-nine".