28218792 has 128 divisors (see below), whose sum is σ = 86169600. Its totient is φ = 7527168.

The previous prime is 28218791. The next prime is 28218809. The reversal of 28218792 is 29781282.

It is a self number, because there is not a number n which added to its sum of digits gives 28218792.

It is not an unprimeable number, because it can be changed into a prime (28218791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258834 + ... + 258942.

It is an arithmetic number, because the mean of its divisors is an integer number (673200).

Almost surely, 2^28218792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28218792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43084800).

28218792 is an abundant number, since it is smaller than the sum of its proper divisors (57950808).

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

28218792 is a wasteful number, since it uses less digits than its factorization.

28218792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 211 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 28218792 is about 5312.1362934322. The cubic root of 28218792 is about 304.4477761824.

The spelling of 28218792 in words is "twenty-eight million, two hundred eighteen thousand, seven hundred ninety-two".