18112644 has 72 divisors (see below), whose sum is σ = 50948352. Its totient is φ = 5378880.

The previous prime is 18112637. The next prime is 18112663. The reversal of 18112644 is 44621181.

It is a happy number.

18112644 is a `hidden beast` number, since 1 + 8 + 1 + 12 + 644 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20557 + ... + 21419.

It is an arithmetic number, because the mean of its divisors is an integer number (707616).

Almost surely, 2^18112644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18112644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25474176).

18112644 is an abundant number, since it is smaller than the sum of its proper divisors (32835708).

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

18112644 is a wasteful number, since it uses less digits than its factorization.

18112644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937 (or 932 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 18112644 is about 4255.8952054768. The cubic root of 18112644 is about 262.6196896356.

The spelling of 18112644 in words is "eighteen million, one hundred twelve thousand, six hundred forty-four".