28871259 has 4 divisors (see below), whose sum is σ = 38495016. Its totient is φ = 19247504.

The previous prime is 28871231. The next prime is 28871267. The reversal of 28871259 is 95217882.

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 28871259 - 2⁷ = 28871131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28871259.

It is not an unprimeable number, because it can be changed into a prime (28871299) 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, 4811874 + ... + 4811879.

It is an arithmetic number, because the mean of its divisors is an integer number (9623754).

Almost surely, 2^28871259 is an apocalyptic number.

28871259 is a deficient number, since it is larger than the sum of its proper divisors (9623757).

28871259 is an equidigital number, since it uses as much as digits as its factorization.

28871259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623756.

The product of its digits is 80640, while the sum is 42.

The square root of 28871259 is about 5373.1982096327. The cubic root of 28871259 is about 306.7763723491.

The spelling of 28871259 in words is "twenty-eight million, eight hundred seventy-one thousand, two hundred fifty-nine".