28368917 has 4 divisors (see below), whose sum is σ = 28470156. Its totient is φ = 28267680.

The previous prime is 28368889. The next prime is 28368929. The reversal of 28368917 is 71986382.

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 20921476 + 7447441 = 4574^2 + 2729^2 .

It is a cyclic number.

It is not a de Polignac number, because 28368917 - 2⁶ = 28368853 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 (28368217) 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, 50198 + ... + 50759.

It is an arithmetic number, because the mean of its divisors is an integer number (7117539).

Almost surely, 2^28368917 is an apocalyptic number.

It is an amenable number.

28368917 is a deficient number, since it is larger than the sum of its proper divisors (101239).

28368917 is a wasteful number, since it uses less digits than its factorization.

28368917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101238.

The product of its digits is 145152, while the sum is 44.

The square root of 28368917 is about 5326.2479288895. The cubic root of 28368917 is about 304.9867126703.

The spelling of 28368917 in words is "twenty-eight million, three hundred sixty-eight thousand, nine hundred seventeen".