28823784 has 128 divisors (see below), whose sum is σ = 84602880. Its totient is φ = 8096000.

The previous prime is 28823783. The next prime is 28823819. The reversal of 28823784 is 48732882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28823783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285334 + ... + 285434.

It is an arithmetic number, because the mean of its divisors is an integer number (660960).

Almost surely, 2^28823784 is an apocalyptic number.

28823784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28823784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42301440).

28823784 is an abundant number, since it is smaller than the sum of its proper divisors (55779096).

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

28823784 is a wasteful number, since it uses less digits than its factorization.

28823784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 187 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 28823784 is about 5368.7786320540. The cubic root of 28823784 is about 306.6081289234.

It can be divided in two parts, 2882 and 3784, that added together give a palindrome (6666).

The spelling of 28823784 in words is "twenty-eight million, eight hundred twenty-three thousand, seven hundred eighty-four".