18664884 has 72 divisors (see below), whose sum is σ = 56306880. Its totient is φ = 5331312.

The previous prime is 18664879. The next prime is 18664889. The reversal of 18664884 is 48846681.

It is an interprime number because it is at equal distance from previous prime (18664879) and next prime (18664889).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18664889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3529 + ... + 7055.

It is an arithmetic number, because the mean of its divisors is an integer number (782040).

Almost surely, 2^18664884 is an apocalyptic number.

18664884 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 18664884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28153440).

18664884 is an abundant number, since it is smaller than the sum of its proper divisors (37641996).

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

18664884 is a wasteful number, since it uses less digits than its factorization.

18664884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3554 (or 3539 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 18664884 is about 4320.2874904339. The cubic root of 18664884 is about 265.2620358140.

The spelling of 18664884 in words is "eighteen million, six hundred sixty-four thousand, eight hundred eighty-four".