28723259 has 4 divisors (see below), whose sum is σ = 28843680. Its totient is φ = 28602840.

The previous prime is 28723249. The next prime is 28723309. The reversal of 28723259 is 95232782.

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 28723259 - 2²⁰ = 27674683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28723249) 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, 59852 + ... + 60329.

It is an arithmetic number, because the mean of its divisors is an integer number (7210920).

Almost surely, 2^28723259 is an apocalyptic number.

28723259 is a deficient number, since it is larger than the sum of its proper divisors (120421).

28723259 is a wasteful number, since it uses less digits than its factorization.

28723259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120420.

The product of its digits is 60480, while the sum is 38.

The square root of 28723259 is about 5359.4084561638. The cubic root of 28723259 is about 306.2512745192.

It can be divided in two parts, 28723 and 259, that added together give a palindrome (28982).

The spelling of 28723259 in words is "twenty-eight million, seven hundred twenty-three thousand, two hundred fifty-nine".