28173966 has 8 divisors (see below), whose sum is σ = 56347944. Its totient is φ = 9391320.

The previous prime is 28173949. The next prime is 28173991. The reversal of 28173966 is 66937182.

It is a happy number.

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

28173966 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 2347825 + ... + 2347836.

It is an arithmetic number, because the mean of its divisors is an integer number (7043493).

Almost surely, 2^28173966 is an apocalyptic number.

28173966 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.

28173966 is a wasteful number, since it uses less digits than its factorization.

28173966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695666.

The product of its digits is 108864, while the sum is 42.

The square root of 28173966 is about 5307.9154100268. The cubic root of 28173966 is about 304.2864840353.

It can be divided in two parts, 281 and 73966, that added together give a palindrome (74247).

The spelling of 28173966 in words is "twenty-eight million, one hundred seventy-three thousand, nine hundred sixty-six".