28178229 has 8 divisors (see below), whose sum is σ = 37595520. Its totient is φ = 18773216.

The previous prime is 28178207. The next prime is 28178233. The reversal of 28178229 is 92287182.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28178229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28178429) 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, 7177 + ... + 10385.

It is an arithmetic number, because the mean of its divisors is an integer number (4699440).

Almost surely, 2^28178229 is an apocalyptic number.

It is an amenable number.

28178229 is a deficient number, since it is larger than the sum of its proper divisors (9417291).

28178229 is a wasteful number, since it uses less digits than its factorization.

28178229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6139.

The product of its digits is 32256, while the sum is 39.

The square root of 28178229 is about 5308.3169649146. The cubic root of 28178229 is about 304.3018304472.

The spelling of 28178229 in words is "twenty-eight million, one hundred seventy-eight thousand, two hundred twenty-nine".