28988093 has 4 divisors (see below), whose sum is σ = 29396448. Its totient is φ = 28579740.

The previous prime is 28988039. The next prime is 28988117. The reversal of 28988093 is 39088982.

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 28988093 - 2⁸ = 28987837 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 (28988593) 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, 204071 + ... + 204212.

It is an arithmetic number, because the mean of its divisors is an integer number (7349112).

Almost surely, 2^28988093 is an apocalyptic number.

It is an amenable number.

28988093 is a deficient number, since it is larger than the sum of its proper divisors (408355).

28988093 is an equidigital number, since it uses as much as digits as its factorization.

28988093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408354.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 28988093 is about 5384.0591564358. The cubic root of 28988093 is about 307.1896284487.

The spelling of 28988093 in words is "twenty-eight million, nine hundred eighty-eight thousand, ninety-three".