28230707 has 4 divisors (see below), whose sum is σ = 28570920. Its totient is φ = 27890496.

The previous prime is 28230701. The next prime is 28230721. The reversal of 28230707 is 70703282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28230707 - 2²⁰ = 27182131 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 28230707.

It is not an unprimeable number, because it can be changed into a prime (28230701) 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, 169982 + ... + 170147.

It is an arithmetic number, because the mean of its divisors is an integer number (7142730).

Almost surely, 2^28230707 is an apocalyptic number.

28230707 is a deficient number, since it is larger than the sum of its proper divisors (340213).

28230707 is an equidigital number, since it uses as much as digits as its factorization.

28230707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340212.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 28230707 is about 5313.2576636184. The cubic root of 28230707 is about 304.4906197931.

Adding to 28230707 its reverse (70703282), we get a palindrome (98933989).

The spelling of 28230707 in words is "twenty-eight million, two hundred thirty thousand, seven hundred seven".