28431093 has 4 divisors (see below), whose sum is σ = 37908128. Its totient is φ = 18954060.

The previous prime is 28431083. The next prime is 28431113. The reversal of 28431093 is 39013482.

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 28431093 - 2²¹ = 26333941 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 28431093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4738513 + ... + 4738518.

It is an arithmetic number, because the mean of its divisors is an integer number (9477032).

Almost surely, 2^28431093 is an apocalyptic number.

It is an amenable number.

28431093 is a deficient number, since it is larger than the sum of its proper divisors (9477035).

28431093 is an equidigital number, since it uses as much as digits as its factorization.

28431093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9477034.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28431093 is about 5332.0814884996. The cubic root of 28431093 is about 305.2093626584.

The spelling of 28431093 in words is "twenty-eight million, four hundred thirty-one thousand, ninety-three".