28178166 has 8 divisors (see below), whose sum is σ = 56356344. Its totient is φ = 9392720.

The previous prime is 28178153. The next prime is 28178173. The reversal of 28178166 is 66187182.

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

28178166 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2348175 + ... + 2348186.

It is an arithmetic number, because the mean of its divisors is an integer number (7044543).

Almost surely, 2^28178166 is an apocalyptic number.

28178166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28178166 is a wasteful number, since it uses less digits than its factorization.

28178166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4696366.

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

The square root of 28178166 is about 5308.3110308270. The cubic root of 28178166 is about 304.3016036642.

The spelling of 28178166 in words is "twenty-eight million, one hundred seventy-eight thousand, one hundred sixty-six".