28255867 has 4 divisors (see below), whose sum is σ = 28734840. Its totient is φ = 27776896.

The previous prime is 28255841. The next prime is 28255873. The reversal of 28255867 is 76855282.

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 28255867 - 2⁷ = 28255739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28255807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239398 + ... + 239515.

It is an arithmetic number, because the mean of its divisors is an integer number (7183710).

Almost surely, 2^28255867 is an apocalyptic number.

28255867 is a deficient number, since it is larger than the sum of its proper divisors (478973).

28255867 is an equidigital number, since it uses as much as digits as its factorization.

28255867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478972.

The product of its digits is 268800, while the sum is 43.

The square root of 28255867 is about 5315.6247986479. The cubic root of 28255867 is about 304.5810498017.

The spelling of 28255867 in words is "twenty-eight million, two hundred fifty-five thousand, eight hundred sixty-seven".