28256878 has 16 divisors (see below), whose sum is σ = 46226880. Its totient is φ = 12875616.

The previous prime is 28256869. The next prime is 28256887. The reversal of 28256878 is 87865282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28256869) and next prime (28256887).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4825 + ... + 8932.

It is an arithmetic number, because the mean of its divisors is an integer number (2889180).

Almost surely, 2^28256878 is an apocalyptic number.

28256878 is a deficient number, since it is larger than the sum of its proper divisors (17970002).

28256878 is a wasteful number, since it uses less digits than its factorization.

28256878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13851.

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

The square root of 28256878 is about 5315.7198948026. The cubic root of 28256878 is about 304.5846824133.

The spelling of 28256878 in words is "twenty-eight million, two hundred fifty-six thousand, eight hundred seventy-eight".