18000078 has 16 divisors (see below), whose sum is σ = 36056016. Its totient is φ = 5990720.

The previous prime is 18000067. The next prime is 18000089. The reversal of 18000078 is 87000081.

It is an interprime number because it is at equal distance from previous prime (18000067) and next prime (18000089).

18000078 is a modest number, since divided by 78 gives 18 as remainder.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2698 + ... + 6578.

It is an arithmetic number, because the mean of its divisors is an integer number (2253501).

Almost surely, 2^18000078 is an apocalyptic number.

18000078 is an abundant number, since it is smaller than the sum of its proper divisors (18055938).

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

18000078 is a wasteful number, since it uses less digits than its factorization.

18000078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4659.

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

The square root of 18000078 is about 4242.6498794975. The cubic root of 18000078 is about 262.0745179719.

The spelling of 18000078 in words is "eighteen million, seventy-eight", and thus it is an aban number and an uban number.