28163789 has 2 divisors, whose sum is σ = 28163790. Its totient is φ = 28163788.

The previous prime is 28163777. The next prime is 28163801. The reversal of 28163789 is 98736182.

It is a balanced prime because it is at equal distance from previous prime (28163777) and next prime (28163801).

It can be written as a sum of positive squares in only one way, i.e., 27741289 + 422500 = 5267^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 28163789 - 2¹² = 28159693 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 (28163489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081894 + 14081895.

It is an arithmetic number, because the mean of its divisors is an integer number (14081895).

Almost surely, 2^28163789 is an apocalyptic number.

It is an amenable number.

28163789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28163789 is an equidigital number, since it uses as much as digits as its factorization.

28163789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 28163789 is about 5306.9566608368. The cubic root of 28163789 is about 304.2498415017.

The spelling of 28163789 in words is "twenty-eight million, one hundred sixty-three thousand, seven hundred eighty-nine".