18219568 has 40 divisors (see below), whose sum is σ = 36882560. Its totient is φ = 8709120.

The previous prime is 18219557. The next prime is 18219583. The reversal of 18219568 is 86591281.

It is a self number, because there is not a number n which added to its sum of digits gives 18219568.

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 7 ways as a sum of consecutive naturals, for example, 53896 + ... + 54232.

It is an arithmetic number, because the mean of its divisors is an integer number (922064).

Almost surely, 2^18219568 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 18219568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18441280).

18219568 is an abundant number, since it is smaller than the sum of its proper divisors (18662992).

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

18219568 is a wasteful number, since it uses less digits than its factorization.

18219568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 479 counting only the distinct ones).

The product of its digits is 34560, while the sum is 40.

The square root of 18219568 is about 4268.4385903981. The cubic root of 18219568 is about 263.1354485501.

The spelling of 18219568 in words is "eighteen million, two hundred nineteen thousand, five hundred sixty-eight".