28116717 has 4 divisors (see below), whose sum is σ = 37488960. Its totient is φ = 18744476.

The previous prime is 28116709. The next prime is 28116719. The reversal of 28116717 is 71761182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28116717 - 2³ = 28116709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28116719) 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, 4686117 + ... + 4686122.

It is an arithmetic number, because the mean of its divisors is an integer number (9372240).

Almost surely, 2^28116717 is an apocalyptic number.

It is an amenable number.

28116717 is a deficient number, since it is larger than the sum of its proper divisors (9372243).

28116717 is an equidigital number, since it uses as much as digits as its factorization.

28116717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9372242.

The product of its digits is 4704, while the sum is 33.

The square root of 28116717 is about 5302.5198726643. The cubic root of 28116717 is about 304.0802426968.

Adding to 28116717 its reverse (71761182), we get a palindrome (99877899).

The spelling of 28116717 in words is "twenty-eight million, one hundred sixteen thousand, seven hundred seventeen".