18018028 has 24 divisors (see below), whose sum is σ = 38156832. Its totient is φ = 7267584.

The previous prime is 18018017. The next prime is 18018029. The reversal of 18018028 is 82081081.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 18017987 and 18018005.

It is not an unprimeable number, because it can be changed into a prime (18018029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18451 + ... + 19402.

It is an arithmetic number, because the mean of its divisors is an integer number (1589868).

Almost surely, 2^18018028 is an apocalyptic number.

It is an amenable number.

18018028 is an abundant number, since it is smaller than the sum of its proper divisors (20138804).

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

18018028 is a wasteful number, since it uses less digits than its factorization.

18018028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37881 (or 37879 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 18018028 is about 4244.7647755794. The cubic root of 18018028 is about 262.1616041639.

The spelling of 18018028 in words is "eighteen million, eighteen thousand, twenty-eight".