18550128 has 80 divisors (see below), whose sum is σ = 51425280. Its totient is φ = 5741568.

The previous prime is 18550127. The next prime is 18550139. The reversal of 18550128 is 82105581.

It is a junction number, because it is equal to n+sod(n) for n = 18550095 and 18550104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18550127) 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 15 ways as a sum of consecutive naturals, for example, 103543 + ... + 103721.

It is an arithmetic number, because the mean of its divisors is an integer number (642816).

Almost surely, 2^18550128 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 18550128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25712640).

18550128 is an abundant number, since it is smaller than the sum of its proper divisors (32875152).

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

18550128 is a wasteful number, since it uses less digits than its factorization.

18550128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 18550128 is about 4306.9859530767. The cubic root of 18550128 is about 264.7172872007.

The spelling of 18550128 in words is "eighteen million, five hundred fifty thousand, one hundred twenty-eight".