28016689 has 2 divisors, whose sum is σ = 28016690. Its totient is φ = 28016688.

The previous prime is 28016683. The next prime is 28016699. The reversal of 28016689 is 98661082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21298225 + 6718464 = 4615^2 + 2592^2 .

It is a cyclic number.

It is not a de Polignac number, because 28016689 - 2⁵ = 28016657 is a prime.

It is not a weakly prime, because it can be changed into another prime (28016683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14008344 + 14008345.

It is an arithmetic number, because the mean of its divisors is an integer number (14008345).

Almost surely, 2^28016689 is an apocalyptic number.

It is an amenable number.

28016689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28016689 is an equidigital number, since it uses as much as digits as its factorization.

28016689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28016689 is about 5293.0793494902. The cubic root of 28016689 is about 303.7192157210.

The spelling of 28016689 in words is "twenty-eight million, sixteen thousand, six hundred eighty-nine".