18000778 has 16 divisors (see below), whose sum is σ = 27599040. Its totient is φ = 8803296.

The previous prime is 18000769. The next prime is 18000779. The reversal of 18000778 is 87700081.

It is not an unprimeable number, because it can be changed into a prime (18000779) by changing a digit.

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, 19851 + ... + 20737.

It is an arithmetic number, because the mean of its divisors is an integer number (1724940).

Almost surely, 2^18000778 is an apocalyptic number.

18000778 is a deficient number, since it is larger than the sum of its proper divisors (9598262).

18000778 is a wasteful number, since it uses less digits than its factorization.

18000778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 18000778 is about 4242.7323743079. The cubic root of 18000778 is about 262.0779151754.

The spelling of 18000778 in words is "eighteen million, seven hundred seventy-eight", and thus it is an aban number.