28282517 has 4 divisors (see below), whose sum is σ = 28438956. Its totient is φ = 28126080.

The previous prime is 28282493. The next prime is 28282523. The reversal of 28282517 is 71528282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 835396 + 27447121 = 914^2 + 5239^2 .

It is a cyclic number.

It is not a de Polignac number, because 28282517 - 2¹⁰ = 28281493 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 (28282547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77948 + ... + 78309.

It is an arithmetic number, because the mean of its divisors is an integer number (7109739).

Almost surely, 2^28282517 is an apocalyptic number.

It is an amenable number.

28282517 is a deficient number, since it is larger than the sum of its proper divisors (156439).

28282517 is a wasteful number, since it uses less digits than its factorization.

28282517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156438.

The product of its digits is 17920, while the sum is 35.

The square root of 28282517 is about 5318.1309686769. The cubic root of 28282517 is about 304.6767766395.

The spelling of 28282517 in words is "twenty-eight million, two hundred eighty-two thousand, five hundred seventeen".