28684788 has 24 divisors (see below), whose sum is σ = 73016160. Its totient is φ = 8692320.

The previous prime is 28684783. The next prime is 28684801. The reversal of 28684788 is 88748682.

It is a self number, because there is not a number n which added to its sum of digits gives 28684788.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108523 + ... + 108786.

It is an arithmetic number, because the mean of its divisors is an integer number (3042340).

Almost surely, 2^28684788 is an apocalyptic number.

It is an amenable number.

28684788 is an abundant number, since it is smaller than the sum of its proper divisors (44331372).

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

28684788 is a wasteful number, since it uses less digits than its factorization.

28684788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217327 (or 217325 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 51.

The square root of 28684788 is about 5355.8181447842. The cubic root of 28684788 is about 306.1144857615.

The spelling of 28684788 in words is "twenty-eight million, six hundred eighty-four thousand, seven hundred eighty-eight".