28047293 has 4 divisors (see below), whose sum is σ = 28104000. Its totient is φ = 27990588.

The previous prime is 28047269. The next prime is 28047301. The reversal of 28047293 is 39274082.

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 28047293 - 2⁸ = 28047037 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 (28047793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27605 + ... + 28602.

It is an arithmetic number, because the mean of its divisors is an integer number (7026000).

Almost surely, 2^28047293 is an apocalyptic number.

It is an amenable number.

28047293 is a deficient number, since it is larger than the sum of its proper divisors (56707).

28047293 is an equidigital number, since it uses as much as digits as its factorization.

28047293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56706.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 28047293 is about 5295.9695051992. The cubic root of 28047293 is about 303.8297645974.

The spelling of 28047293 in words is "twenty-eight million, forty-seven thousand, two hundred ninety-three".