28118017 has 8 divisors (see below), whose sum is σ = 29991816. Its totient is φ = 26268672.

The previous prime is 28118003. The next prime is 28118033. The reversal of 28118017 is 71081182.

It can be written as a sum of positive squares in 4 ways, for example, as 1893376 + 26224641 = 1376^2 + 5121^2 .

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

It is not a de Polignac number, because 28118017 - 2¹⁹ = 27593729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28118047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3708 + ... + 8365.

It is an arithmetic number, because the mean of its divisors is an integer number (3748977).

Almost surely, 2^28118017 is an apocalyptic number.

It is an amenable number.

28118017 is a deficient number, since it is larger than the sum of its proper divisors (1873799).

28118017 is a wasteful number, since it uses less digits than its factorization.

28118017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12227.

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

The square root of 28118017 is about 5302.6424544749. The cubic root of 28118017 is about 304.0849290930.

Adding to 28118017 its reverse (71081182), we get a palindrome (99199199).

The spelling of 28118017 in words is "twenty-eight million, one hundred eighteen thousand, seventeen".