18074728 has 40 divisors (see below), whose sum is σ = 39578130. Its totient is φ = 7738080.

The previous prime is 18074713. The next prime is 18074729. The reversal of 18074728 is 82747081.

It can be written as a sum of positive squares in only one way, i.e., 14607684 + 3467044 = 3822^2 + 1862^2 .

It is not an unprimeable number, because it can be changed into a prime (18074729) 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 9 ways as a sum of consecutive naturals, for example, 18738 + ... + 19678.

Almost surely, 2^18074728 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 18074728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19789065).

18074728 is an abundant number, since it is smaller than the sum of its proper divisors (21503402).

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

18074728 is an frugal number, since it uses more digits than its factorization.

18074728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 950 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 18074728 is about 4251.4383448428. The cubic root of 18074728 is about 262.4363104744.

The spelling of 18074728 in words is "eighteen million, seventy-four thousand, seven hundred twenty-eight".