28022789 has 2 divisors, whose sum is σ = 28022790. Its totient is φ = 28022788.

The previous prime is 28022759. The next prime is 28022831. The reversal of 28022789 is 98722082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24581764 + 3441025 = 4958^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 28022789 - 2²⁴ = 11245573 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28022759) 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, 14011394 + 14011395.

It is an arithmetic number, because the mean of its divisors is an integer number (14011395).

Almost surely, 2^28022789 is an apocalyptic number.

It is an amenable number.

28022789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28022789 is an equidigital number, since it uses as much as digits as its factorization.

28022789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28022789 is about 5293.6555422506. The cubic root of 28022789 is about 303.7412567835.

The spelling of 28022789 in words is "twenty-eight million, twenty-two thousand, seven hundred eighty-nine".