28522789 has 2 divisors, whose sum is σ = 28522790. Its totient is φ = 28522788.

The previous prime is 28522733. The next prime is 28522799. The reversal of 28522789 is 98722582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25908100 + 2614689 = 5090^2 + 1617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28522789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28522799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14261394 + 14261395.

It is an arithmetic number, because the mean of its divisors is an integer number (14261395).

Almost surely, 2^28522789 is an apocalyptic number.

It is an amenable number.

28522789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28522789 is an equidigital number, since it uses as much as digits as its factorization.

28522789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The square root of 28522789 is about 5340.6730849210. The cubic root of 28522789 is about 305.5371310886.

The spelling of 28522789 in words is "twenty-eight million, five hundred twenty-two thousand, seven hundred eighty-nine".