28117611 has 10 divisors (see below), whose sum is σ = 42002972. Its totient is φ = 18745020.

The previous prime is 28117597. The next prime is 28117619. The reversal of 28117611 is 11671182.

It is not a de Polignac number, because 28117611 - 2⁶ = 28117547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28117619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 173485 + ... + 173646.

Almost surely, 2^28117611 is an apocalyptic number.

28117611 is a deficient number, since it is larger than the sum of its proper divisors (13885361).

28117611 is an equidigital number, since it uses as much as digits as its factorization.

28117611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347143 (or 347134 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 28117611 is about 5302.6041715368. The cubic root of 28117611 is about 304.0834655109.

Adding to 28117611 its reverse (11671182), we get a palindrome (39788793).

The spelling of 28117611 in words is "twenty-eight million, one hundred seventeen thousand, six hundred eleven".