8728289 has 2 divisors, whose sum is σ = 8728290. Its totient is φ = 8728288.

The previous prime is 8728273. The next prime is 8728303. The reversal of 8728289 is 9828278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6932689 + 1795600 = 2633^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 8728289 - 2⁴ = 8728273 is a prime.

It is not a weakly prime, because it can be changed into another prime (8758289) 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, 4364144 + 4364145.

It is an arithmetic number, because the mean of its divisors is an integer number (4364145).

Almost surely, 2^8728289 is an apocalyptic number.

It is an amenable number.

8728289 is a deficient number, since it is larger than the sum of its proper divisors (1).

8728289 is an equidigital number, since it uses as much as digits as its factorization.

8728289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 44.

The square root of 8728289 is about 2954.3677834691. The cubic root of 8728289 is about 205.8936910235.

The spelling of 8728289 in words is "eight million, seven hundred twenty-eight thousand, two hundred eighty-nine".