28728259 has 6 divisors (see below), whose sum is σ = 33418644. Its totient is φ = 24624180.

The previous prime is 28728229. The next prime is 28728263. The reversal of 28728259 is 95282782.

It is not a de Polignac number, because 28728259 - 2⁹ = 28727747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28728229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293097 + ... + 293194.

It is an arithmetic number, because the mean of its divisors is an integer number (5569774).

Almost surely, 2^28728259 is an apocalyptic number.

28728259 is a deficient number, since it is larger than the sum of its proper divisors (4690385).

28728259 is an equidigital number, since it uses as much as digits as its factorization.

28728259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586305 (or 586298 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 28728259 is about 5359.8749052567. The cubic root of 28728259 is about 306.2690437137.

The spelling of 28728259 in words is "twenty-eight million, seven hundred twenty-eight thousand, two hundred fifty-nine".