28222173 has 24 divisors (see below), whose sum is σ = 48617088. Its totient is φ = 15424992.

The previous prime is 28222169. The next prime is 28222177. The reversal of 28222173 is 37122282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28222169) and next prime (28222177).

It is not a de Polignac number, because 28222173 - 2² = 28222169 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28222177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8290 + ... + 11187.

It is an arithmetic number, because the mean of its divisors is an integer number (2025712).

Almost surely, 2^28222173 is an apocalyptic number.

28222173 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28222173 is a deficient number, since it is larger than the sum of its proper divisors (20394915).

28222173 is a wasteful number, since it uses less digits than its factorization.

28222173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19513 (or 19510 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 28222173 is about 5312.4545174524. The cubic root of 28222173 is about 304.4599347093.

The spelling of 28222173 in words is "twenty-eight million, two hundred twenty-two thousand, one hundred seventy-three".