18702728 has 36 divisors (see below), whose sum is σ = 38824695. Its totient is φ = 8440080.

The previous prime is 18702713. The next prime is 18702751. The reversal of 18702728 is 82720781.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 9351364 + 9351364 = 3058^2 + 3058^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3058.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 134483 + ... + 134621.

Almost surely, 2^18702728 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 18702728

18702728 is an abundant number, since it is smaller than the sum of its proper divisors (20121967).

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

18702728 is a wasteful number, since it uses less digits than its factorization.

18702728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 18702728 is about 4324.6650737369. The cubic root of 18702728 is about 265.4411922009.

The spelling of 18702728 in words is "eighteen million, seven hundred two thousand, seven hundred twenty-eight".