18072684 has 72 divisors (see below), whose sum is σ = 54032160. Its totient is φ = 4983552.

The previous prime is 18072679. The next prime is 18072697. The reversal of 18072684 is 48627081.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 6072 + ... + 8544.

Almost surely, 2^18072684 is an apocalyptic number.

18072684 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 18072684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27016080).

18072684 is an abundant number, since it is smaller than the sum of its proper divisors (35959476).

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

18072684 is a wasteful number, since it uses less digits than its factorization.

18072684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519 (or 2514 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18072684 is about 4251.1979488140. The cubic root of 18072684 is about 262.4264174709.

The spelling of 18072684 in words is "eighteen million, seventy-two thousand, six hundred eighty-four".