28668167 has 18 divisors (see below), whose sum is σ = 32641392. Its totient is φ = 25148200.

The previous prime is 28668163. The next prime is 28668173. The reversal of 28668167 is 76186682.

It is not a de Polignac number, because 28668167 - 2² = 28668163 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 (28668163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 403742 + ... + 403812.

Almost surely, 2^28668167 is an apocalyptic number.

28668167 is a deficient number, since it is larger than the sum of its proper divisors (3973225).

28668167 is an equidigital number, since it uses as much as digits as its factorization.

28668167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 129 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 28668167 is about 5354.2662429132. The cubic root of 28668167 is about 306.0553497496.

The spelling of 28668167 in words is "twenty-eight million, six hundred sixty-eight thousand, one hundred sixty-seven".