28112517 has 12 divisors (see below), whose sum is σ = 40980940. Its totient is φ = 18569088.

The previous prime is 28112507. The next prime is 28112551. The reversal of 28112517 is 71521182.

It can be written as a sum of positive squares in 2 ways, for example, as 12383361 + 15729156 = 3519^2 + 3966^2 .

It is not a de Polignac number, because 28112517 - 2⁷ = 28112389 is a prime.

It is a super-2 number, since 2×28112517² = 1580627224150578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28112507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13348 + ... + 15309.

Almost surely, 2^28112517 is an apocalyptic number.

It is an amenable number.

28112517 is a deficient number, since it is larger than the sum of its proper divisors (12868423).

28112517 is a wasteful number, since it uses less digits than its factorization.

28112517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28772 (or 28769 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 28112517 is about 5302.1238197537. The cubic root of 28112517 is about 304.0651010450.

Adding to 28112517 its reverse (71521182), we get a palindrome (99633699).

The spelling of 28112517 in words is "twenty-eight million, one hundred twelve thousand, five hundred seventeen".