28578256 has 80 divisors (see below), whose sum is σ = 66424320. Its totient is φ = 11658240.

The previous prime is 28578217. The next prime is 28578257. The reversal of 28578256 is 65287582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28578257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321060 + ... + 321148.

It is an arithmetic number, because the mean of its divisors is an integer number (830304).

Almost surely, 2^28578256 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 28578256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33212160).

28578256 is an abundant number, since it is smaller than the sum of its proper divisors (37846064).

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

28578256 is a wasteful number, since it uses less digits than its factorization.

28578256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 206 counting only the distinct ones).

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

The square root of 28578256 is about 5345.8634475639. The cubic root of 28578256 is about 305.7350576705.

The spelling of 28578256 in words is "twenty-eight million, five hundred seventy-eight thousand, two hundred fifty-six".