28617115 has 4 divisors (see below), whose sum is σ = 34340544. Its totient is φ = 22893688.

The previous prime is 28617109. The next prime is 28617119. The reversal of 28617115 is 51171682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51171682 = 2 ⋅25585841.

It is a cyclic number.

It is not a de Polignac number, because 28617115 - 2²¹ = 26519963 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28617119) 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, 2861707 + ... + 2861716.

It is an arithmetic number, because the mean of its divisors is an integer number (8585136).

Almost surely, 2^28617115 is an apocalyptic number.

28617115 is a deficient number, since it is larger than the sum of its proper divisors (5723429).

28617115 is an equidigital number, since it uses as much as digits as its factorization.

28617115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5723428.

The product of its digits is 3360, while the sum is 31.

The square root of 28617115 is about 5349.4967052985. The cubic root of 28617115 is about 305.8735683135.

Adding to 28617115 its reverse (51171682), we get a palindrome (79788797).

The spelling of 28617115 in words is "twenty-eight million, six hundred seventeen thousand, one hundred fifteen".