28591293 has 4 divisors (see below), whose sum is σ = 38121728. Its totient is φ = 19060860.

The previous prime is 28591267. The next prime is 28591301. The reversal of 28591293 is 39219582.

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 not a de Polignac number, because 28591293 - 2⁵ = 28591261 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 (28591243) 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, 4765213 + ... + 4765218.

It is an arithmetic number, because the mean of its divisors is an integer number (9530432).

Almost surely, 2^28591293 is an apocalyptic number.

It is an amenable number.

28591293 is a deficient number, since it is larger than the sum of its proper divisors (9530435).

28591293 is an equidigital number, since it uses as much as digits as its factorization.

28591293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9530434.

The product of its digits is 38880, while the sum is 39.

The square root of 28591293 is about 5347.0826625366. The cubic root of 28591293 is about 305.7815412861.

The spelling of 28591293 in words is "twenty-eight million, five hundred ninety-one thousand, two hundred ninety-three".