28104617 has 4 divisors (see below), whose sum is σ = 28154580. Its totient is φ = 28054656.

The previous prime is 28104613. The next prime is 28104619. The reversal of 28104617 is 71640182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71640182 = 2 ⋅35820091.

It can be written as a sum of positive squares in 2 ways, for example, as 13808656 + 14295961 = 3716^2 + 3781^2 .

It is a cyclic number.

It is not a de Polignac number, because 28104617 - 2² = 28104613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28104617.

It is not an unprimeable number, because it can be changed into a prime (28104613) 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, 24128 + ... + 25265.

It is an arithmetic number, because the mean of its divisors is an integer number (7038645).

Almost surely, 2^28104617 is an apocalyptic number.

It is an amenable number.

28104617 is a deficient number, since it is larger than the sum of its proper divisors (49963).

28104617 is an equidigital number, since it uses as much as digits as its factorization.

28104617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49962.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 28104617 is about 5301.3787829205. The cubic root of 28104617 is about 304.0366162324.

Adding to 28104617 its reverse (71640182), we get a palindrome (99744799).

The spelling of 28104617 in words is "twenty-eight million, one hundred four thousand, six hundred seventeen".