28807093 has 4 divisors (see below), whose sum is σ = 32922400. Its totient is φ = 24691788.

The previous prime is 28807081. The next prime is 28807139. The reversal of 28807093 is 39070882.

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 a de Polignac number, because none of the positive numbers 2^k-28807093 is a prime.

It is a super-2 number, since 2×28807093² = 1659697214221298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28807003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057643 + ... + 2057656.

It is an arithmetic number, because the mean of its divisors is an integer number (8230600).

Almost surely, 2^28807093 is an apocalyptic number.

It is an amenable number.

28807093 is a deficient number, since it is larger than the sum of its proper divisors (4115307).

28807093 is an equidigital number, since it uses as much as digits as its factorization.

28807093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115306.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28807093 is about 5367.2239565720. The cubic root of 28807093 is about 306.5489349326.

The spelling of 28807093 in words is "twenty-eight million, eight hundred seven thousand, ninety-three".