28194893 has 4 divisors (see below), whose sum is σ = 28485660. Its totient is φ = 27904128.

The previous prime is 28194869. The next prime is 28194919. The reversal of 28194893 is 39849182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22108804 + 6086089 = 4702^2 + 2467^2 .

It is a cyclic number.

It is not a de Polignac number, because 28194893 - 2⁸ = 28194637 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 (28194853) 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 3 ways as a sum of consecutive naturals, for example, 145238 + ... + 145431.

It is an arithmetic number, because the mean of its divisors is an integer number (7121415).

Almost surely, 2^28194893 is an apocalyptic number.

It is an amenable number.

28194893 is a deficient number, since it is larger than the sum of its proper divisors (290767).

28194893 is an equidigital number, since it uses as much as digits as its factorization.

28194893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290766.

The product of its digits is 124416, while the sum is 44.

The square root of 28194893 is about 5309.8863452997. The cubic root of 28194893 is about 304.3618044840.

The spelling of 28194893 in words is "twenty-eight million, one hundred ninety-four thousand, eight hundred ninety-three".