18078 has 16 divisors (see below), whose sum is σ = 38016. Its totient is φ = 5720.

The previous prime is 18077. The next prime is 18089. The reversal of 18078 is 87081.

It is a plaindrome in base 16.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077) 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, 73 + ... + 203.

It is an arithmetic number, because the mean of its divisors is an integer number (2376).

2¹⁸⁰⁷⁸ is an apocalyptic number.

18078 is an abundant number, since it is smaller than the sum of its proper divisors (19938).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19008).

18078 is a wasteful number, since it uses less digits than its factorization.

18078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 18078 is about 134.4544532546. The cubic root of 18078 is about 26.2452145472.

The spelling of 18078 in words is "eighteen thousand, seventy-eight".