28388284 has 24 divisors (see below), whose sum is σ = 50893920. Its totient is φ = 13850304.

The previous prime is 28388267. The next prime is 28388323. The reversal of 28388284 is 48288382.

It is a self number, because there is not a number n which added to its sum of digits gives 28388284.

It is a congruent number.

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, 75922 + ... + 76294.

It is an arithmetic number, because the mean of its divisors is an integer number (2120580).

Almost surely, 2^28388284 is an apocalyptic number.

It is an amenable number.

28388284 is a deficient number, since it is larger than the sum of its proper divisors (22505636).

28388284 is a wasteful number, since it uses less digits than its factorization.

28388284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 787 counting only the distinct ones).

The product of its digits is 196608, while the sum is 43.

The square root of 28388284 is about 5328.0656902857. The cubic root of 28388284 is about 305.0561000452.

The spelling of 28388284 in words is "twenty-eight million, three hundred eighty-eight thousand, two hundred eighty-four".