28531717 has 2 divisors, whose sum is σ = 28531718. Its totient is φ = 28531716.

The previous prime is 28531703. The next prime is 28531733. The reversal of 28531717 is 71713582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14737921 + 13793796 = 3839^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 28531717 - 2⁷ = 28531589 is a prime.

It is equal to p_1772467 and since 28531717 and 1772467 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28531417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265858 + 14265859.

It is an arithmetic number, because the mean of its divisors is an integer number (14265859).

Almost surely, 2^28531717 is an apocalyptic number.

It is an amenable number.

28531717 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531717 is an equidigital number, since it uses as much as digits as its factorization.

28531717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The square root of 28531717 is about 5341.5088692241. The cubic root of 28531717 is about 305.5690067810.

The spelling of 28531717 in words is "twenty-eight million, five hundred thirty-one thousand, seven hundred seventeen".