18078004 has 48 divisors (see below), whose sum is σ = 38683008. Its totient is φ = 7216128.

The previous prime is 18077999. The next prime is 18078019. The reversal of 18078004 is 40087081.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77472 + ... + 77704.

It is an arithmetic number, because the mean of its divisors is an integer number (805896).

Almost surely, 2^18078004 is an apocalyptic number.

18078004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18078004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19341504).

18078004 is an abundant number, since it is smaller than the sum of its proper divisors (20605004).

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

18078004 is a wasteful number, since it uses less digits than its factorization.

18078004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 18078004 is about 4251.8236087590. The cubic root of 18078004 is about 262.4521648285.

The spelling of 18078004 in words is "eighteen million, seventy-eight thousand, four".