28168345 has 8 divisors (see below), whose sum is σ = 33864840. Its totient is φ = 22492800.

The previous prime is 28168339. The next prime is 28168373. The reversal of 28168345 is 54386182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4897369 + 23270976 = 2213^2 + 4824^2 .

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

It is not a de Polignac number, because 28168345 - 2⁵ = 28168313 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2106 + ... + 7795.

It is an arithmetic number, because the mean of its divisors is an integer number (4233105).

Almost surely, 2^28168345 is an apocalyptic number.

It is an amenable number.

28168345 is a deficient number, since it is larger than the sum of its proper divisors (5696495).

28168345 is an equidigital number, since it uses as much as digits as its factorization.

28168345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10475.

The product of its digits is 46080, while the sum is 37.

The square root of 28168345 is about 5307.3858913782. The cubic root of 28168345 is about 304.2662465805.

The spelling of 28168345 in words is "twenty-eight million, one hundred sixty-eight thousand, three hundred forty-five".