28180117 has 8 divisors (see below), whose sum is σ = 32647616. Its totient is φ = 23823072.

The previous prime is 28180099. The next prime is 28180121. The reversal of 28180117 is 71108182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28180117 - 2⁷ = 28179989 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 (28180177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27063 + ... + 28084.

It is an arithmetic number, because the mean of its divisors is an integer number (4080952).

Almost surely, 2^28180117 is an apocalyptic number.

It is an amenable number.

28180117 is a deficient number, since it is larger than the sum of its proper divisors (4467499).

28180117 is an equidigital number, since it uses as much as digits as its factorization.

28180117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55227.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 28180117 is about 5308.4947960792. The cubic root of 28180117 is about 304.3086265808.

Adding to 28180117 its reverse (71108182), we get a palindrome (99288299).

The spelling of 28180117 in words is "twenty-eight million, one hundred eighty thousand, one hundred seventeen".