18744564 has 36 divisors (see below), whose sum is σ = 46171104. Its totient is φ = 5917968.

The previous prime is 18744529. The next prime is 18744569. The reversal of 18744564 is 46544781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18744569) 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 11 ways as a sum of consecutive naturals, for example, 2169 + ... + 6495.

Almost surely, 2^18744564 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 18744564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23085552).

18744564 is an abundant number, since it is smaller than the sum of its proper divisors (27426540).

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

18744564 is a wasteful number, since it uses less digits than its factorization.

18744564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372 (or 4351 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 18744564 is about 4329.4992782076. The cubic root of 18744564 is about 265.6389659831.

The spelling of 18744564 in words is "eighteen million, seven hundred forty-four thousand, five hundred sixty-four".