28785216 has 56 divisors (see below), whose sum is σ = 80650080. Its totient is φ = 9029632.

The previous prime is 28785193. The next prime is 28785221. The reversal of 28785216 is 61258782.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 1146 + ... + 7673.

It is an arithmetic number, because the mean of its divisors is an integer number (1440180).

Almost surely, 2^28785216 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 28785216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40325040).

28785216 is an abundant number, since it is smaller than the sum of its proper divisors (51864864).

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

28785216 is a wasteful number, since it uses less digits than its factorization.

28785216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8851 (or 8841 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 28785216 is about 5365.1855513113. The cubic root of 28785216 is about 306.4713143568.

The spelling of 28785216 in words is "twenty-eight million, seven hundred eighty-five thousand, two hundred sixteen".