18087028 has 24 divisors (see below), whose sum is σ = 32330592. Its totient is φ = 8852064.

The previous prime is 18087023. The next prime is 18087029. The reversal of 18087028 is 82078081.

It is a junction number, because it is equal to n+sod(n) for n = 18086984 and 18087002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18087023) 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, 51951 + ... + 52297.

It is an arithmetic number, because the mean of its divisors is an integer number (1347108).

Almost surely, 2^18087028 is an apocalyptic number.

It is an amenable number.

18087028 is a deficient number, since it is larger than the sum of its proper divisors (14243564).

18087028 is a wasteful number, since it uses less digits than its factorization.

18087028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 18087028 is about 4252.8846680812. The cubic root of 18087028 is about 262.4958269934.

It can be divided in two parts, 1808 and 7028, that added together give a square (8836 = 94²).

The spelling of 18087028 in words is "eighteen million, eighty-seven thousand, twenty-eight".