28578816 has 132 divisors (see below), whose sum is σ = 94522272. Its totient is φ = 8146944.

The previous prime is 28578791. The next prime is 28578821. The reversal of 28578816 is 61887582.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64291 + ... + 64733.

Almost surely, 2^28578816 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 28578816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47261136).

28578816 is an abundant number, since it is smaller than the sum of its proper divisors (65943456).

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

28578816 is a wasteful number, since it uses less digits than its factorization.

28578816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 455 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28578816 is about 5345.9158242531. The cubic root of 28578816 is about 305.7370546493.

The spelling of 28578816 in words is "twenty-eight million, five hundred seventy-eight thousand, eight hundred sixteen".