28017213 has 16 divisors (see below), whose sum is σ = 42902016. Its totient is φ = 15931440.

The previous prime is 28017203. The next prime is 28017221. The reversal of 28017213 is 31271082.

It is not a de Polignac number, because 28017213 - 2⁸ = 28016957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28017203) 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 15 ways as a sum of consecutive naturals, for example, 1270 + ... + 7592.

It is an arithmetic number, because the mean of its divisors is an integer number (2681376).

Almost surely, 2^28017213 is an apocalyptic number.

It is an amenable number.

28017213 is a deficient number, since it is larger than the sum of its proper divisors (14884803).

28017213 is a wasteful number, since it uses less digits than its factorization.

28017213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6544.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 28017213 is about 5293.1288478555. The cubic root of 28017213 is about 303.7211092100.

Adding to 28017213 its reverse (31271082), we get a palindrome (59288295).

The spelling of 28017213 in words is "twenty-eight million, seventeen thousand, two hundred thirteen".