28265887 has 4 divisors (see below), whose sum is σ = 30440200. Its totient is φ = 26091576.

The previous prime is 28265879. The next prime is 28265903. The reversal of 28265887 is 78856282.

It is a happy number.

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 28265887 - 2³ = 28265879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28265837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1087137 + ... + 1087162.

It is an arithmetic number, because the mean of its divisors is an integer number (7610050).

Almost surely, 2^28265887 is an apocalyptic number.

28265887 is a deficient number, since it is larger than the sum of its proper divisors (2174313).

28265887 is a wasteful number, since it uses less digits than its factorization.

28265887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174312.

The product of its digits is 430080, while the sum is 46.

The square root of 28265887 is about 5316.5672195506. The cubic root of 28265887 is about 304.6170487140.

The spelling of 28265887 in words is "twenty-eight million, two hundred sixty-five thousand, eight hundred eighty-seven".