28344989 has 2 divisors, whose sum is σ = 28344990. Its totient is φ = 28344988.

The previous prime is 28344961. The next prime is 28345007. The reversal of 28344989 is 98944382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26265625 + 2079364 = 5125^2 + 1442^2 .

It is a cyclic number.

It is not a de Polignac number, because 28344989 - 2¹⁶ = 28279453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28344929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14172494 + 14172495.

It is an arithmetic number, because the mean of its divisors is an integer number (14172495).

Almost surely, 2^28344989 is an apocalyptic number.

It is an amenable number.

28344989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28344989 is an equidigital number, since it uses as much as digits as its factorization.

28344989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 47.

The square root of 28344989 is about 5324.0012208864. The cubic root of 28344989 is about 304.9009406873.

The spelling of 28344989 in words is "twenty-eight million, three hundred forty-four thousand, nine hundred eighty-nine".