18427728 has 80 divisors (see below), whose sum is σ = 55014336. Its totient is φ = 5253120.

The previous prime is 18427697. The next prime is 18427741. The reversal of 18427728 is 82772481.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7950 + ... + 10002.

Almost surely, 2^18427728 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 18427728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27507168).

18427728 is an abundant number, since it is smaller than the sum of its proper divisors (36586608).

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

18427728 is a wasteful number, since it uses less digits than its factorization.

18427728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092 (or 2086 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 18427728 is about 4292.7529628433. The cubic root of 18427728 is about 264.1337705899.

The spelling of 18427728 in words is "eighteen million, four hundred twenty-seven thousand, seven hundred twenty-eight".