28085517 has 6 divisors (see below), whose sum is σ = 40567982. Its totient is φ = 18723672.

The previous prime is 28085489. The next prime is 28085521. The reversal of 28085517 is 71558082.

It can be written as a sum of positive squares in only one way, i.e., 22982436 + 5103081 = 4794^2 + 2259^2 .

It is not a de Polignac number, because 28085517 - 2²⁰ = 27036941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28085537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1560298 + ... + 1560315.

Almost surely, 2^28085517 is an apocalyptic number.

It is an amenable number.

28085517 is a deficient number, since it is larger than the sum of its proper divisors (12482465).

28085517 is a wasteful number, since it uses less digits than its factorization.

28085517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120619 (or 3120616 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 28085517 is about 5299.5770585963. The cubic root of 28085517 is about 303.9677258270.

The spelling of 28085517 in words is "twenty-eight million, eighty-five thousand, five hundred seventeen".