28281893 has 4 divisors (see below), whose sum is σ = 28311648. Its totient is φ = 28252140.

The previous prime is 28281887. The next prime is 28281901. The reversal of 28281893 is 39818282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28281893 - 2²⁰ = 27233317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28281893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28281493) 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, 13403 + ... + 15368.

It is an arithmetic number, because the mean of its divisors is an integer number (7077912).

Almost surely, 2^28281893 is an apocalyptic number.

It is an amenable number.

28281893 is a deficient number, since it is larger than the sum of its proper divisors (29755).

28281893 is an equidigital number, since it uses as much as digits as its factorization.

28281893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29754.

The product of its digits is 55296, while the sum is 41.

The square root of 28281893 is about 5318.0723011257. The cubic root of 28281893 is about 304.6745359183.

The spelling of 28281893 in words is "twenty-eight million, two hundred eighty-one thousand, eight hundred ninety-three".