28218173 has 16 divisors (see below), whose sum is σ = 30623040. Its totient is φ = 25920000.

The previous prime is 28218167. The next prime is 28218187. The reversal of 28218173 is 37181282.

It is a cyclic number.

It is not a de Polignac number, because 28218173 - 2⁶ = 28218109 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 (28218103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112298 + ... + 112548.

It is an arithmetic number, because the mean of its divisors is an integer number (1913940).

Almost surely, 2^28218173 is an apocalyptic number.

It is an amenable number.

28218173 is a deficient number, since it is larger than the sum of its proper divisors (2404867).

28218173 is a wasteful number, since it uses less digits than its factorization.

28218173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428.

The product of its digits is 5376, while the sum is 32.

The square root of 28218173 is about 5312.0780303004. The cubic root of 28218173 is about 304.4455500707.

The spelling of 28218173 in words is "twenty-eight million, two hundred eighteen thousand, one hundred seventy-three".