28682784 has 144 divisors (see below), whose sum is σ = 90260352. Its totient is φ = 8584704.

The previous prime is 28682783. The next prime is 28682809. The reversal of 28682784 is 48728682.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (28682783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175887 + ... + 176049.

It is an arithmetic number, because the mean of its divisors is an integer number (626808).

Almost surely, 2^28682784 is an apocalyptic number.

28682784 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 28682784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45130176).

28682784 is an abundant number, since it is smaller than the sum of its proper divisors (61577568).

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

28682784 is a wasteful number, since it uses less digits than its factorization.

28682784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 228 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28682784 is about 5355.6310552539. The cubic root of 28682784 is about 306.1073569224.

The spelling of 28682784 in words is "twenty-eight million, six hundred eighty-two thousand, seven hundred eighty-four".