18428928 has 88 divisors (see below), whose sum is σ = 56202432. Its totient is φ = 5259264.

The previous prime is 18428909. The next prime is 18428929. The reversal of 18428928 is 82982481.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 18428928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21076 + ... + 21932.

It is an arithmetic number, because the mean of its divisors is an integer number (638664).

Almost surely, 2^18428928 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 18428928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28101216).

18428928 is an abundant number, since it is smaller than the sum of its proper divisors (37773504).

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

18428928 is an equidigital number, since it uses as much as digits as its factorization.

18428928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887 (or 869 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 18428928 is about 4292.8927310148. The cubic root of 18428928 is about 264.1395038640.

The spelling of 18428928 in words is "eighteen million, four hundred twenty-eight thousand, nine hundred twenty-eight".