28217007289 has 2 divisors, whose sum is σ = 28217007290. Its totient is φ = 28217007288.

The previous prime is 28217007199. The next prime is 28217007317. The reversal of 28217007289 is 98270071282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27260651664 + 956355625 = 165108^2 + 30925^2 .

It is a cyclic number.

It is not a de Polignac number, because 28217007289 - 2⁹ = 28217006777 is a prime.

It is not a weakly prime, because it can be changed into another prime (28217007389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14108503644 + 14108503645.

It is an arithmetic number, because the mean of its divisors is an integer number (14108503645).

Almost surely, 2^28217007289 is an apocalyptic number.

It is an amenable number.

28217007289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28217007289 is an equidigital number, since it uses as much as digits as its factorization.

28217007289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 28217007289 in words is "twenty-eight billion, two hundred seventeen million, seven thousand, two hundred eighty-nine".