28198784 has 32 divisors (see below), whose sum is σ = 59486400. Its totient is φ = 13268992.

The previous prime is 28198783. The next prime is 28198799. The reversal of 28198784 is 48789182.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28198783) 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 3 ways as a sum of consecutive naturals, for example, 4304 + ... + 8655.

It is an arithmetic number, because the mean of its divisors is an integer number (1858950).

Almost surely, 2^28198784 is an apocalyptic number.

It is an amenable number.

28198784 is an abundant number, since it is smaller than the sum of its proper divisors (31287616).

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

28198784 is a wasteful number, since it uses less digits than its factorization.

28198784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12990 (or 12978 counting only the distinct ones).

The product of its digits is 258048, while the sum is 47.

The square root of 28198784 is about 5310.2527246827. The cubic root of 28198784 is about 304.3758048599.

It can be divided in two parts, 28198 and 784, that added together give a palindrome (28982).

The spelling of 28198784 in words is "twenty-eight million, one hundred ninety-eight thousand, seven hundred eighty-four".