28268717 has 4 divisors (see below), whose sum is σ = 28475196. Its totient is φ = 28062240.

The previous prime is 28268711. The next prime is 28268731. The reversal of 28268717 is 71786282.

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 24344356 + 3924361 = 4934^2 + 1981^2 .

It is a cyclic number.

It is not a de Polignac number, because 28268717 - 2⁴ = 28268701 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 (28268711) 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, 103034 + ... + 103307.

It is an arithmetic number, because the mean of its divisors is an integer number (7118799).

Almost surely, 2^28268717 is an apocalyptic number.

It is an amenable number.

28268717 is a deficient number, since it is larger than the sum of its proper divisors (206479).

28268717 is a wasteful number, since it uses less digits than its factorization.

28268717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206478.

The product of its digits is 75264, while the sum is 41.

The square root of 28268717 is about 5316.8333620681. The cubic root of 28268717 is about 304.6272145307.

The spelling of 28268717 in words is "twenty-eight million, two hundred sixty-eight thousand, seven hundred seventeen".