2728289 has 2 divisors, whose sum is σ = 2728290. Its totient is φ = 2728288.

The previous prime is 2728277. The next prime is 2728301. The reversal of 2728289 is 9828272.

It is a balanced prime because it is at equal distance from previous prime (2728277) and next prime (2728301).

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 1227664 = 1225^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 2728289 - 2¹² = 2724193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2728259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364144 + 1364145.

It is an arithmetic number, because the mean of its divisors is an integer number (1364145).

2^2728289 is an apocalyptic number.

It is an amenable number.

2728289 is a deficient number, since it is larger than the sum of its proper divisors (1).

2728289 is an equidigital number, since it uses as much as digits as its factorization.

2728289 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2728289 is about 1651.7533108791. The cubic root of 2728289 is about 139.7322945472.

The spelling of 2728289 in words is "two million, seven hundred twenty-eight thousand, two hundred eighty-nine".