28878256 has 40 divisors (see below), whose sum is σ = 61924608. Its totient is φ = 12936000.

The previous prime is 28878251. The next prime is 28878281. The reversal of 28878256 is 65287882.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28878251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11341 + ... + 13651.

Almost surely, 2^28878256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28878256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30962304).

28878256 is an abundant number, since it is smaller than the sum of its proper divisors (33046352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28878256 is a wasteful number, since it uses less digits than its factorization.

28878256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401 (or 2395 counting only the distinct ones).

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

The square root of 28878256 is about 5373.8492721698. The cubic root of 28878256 is about 306.8011529437.

The spelling of 28878256 in words is "twenty-eight million, eight hundred seventy-eight thousand, two hundred fifty-six".