18268544 has 32 divisors (see below), whose sum is σ = 41595600. Its totient is φ = 7828992.

The previous prime is 18268543. The next prime is 18268553. The reversal of 18268544 is 44586281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 18268498 and 18268507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18268543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9299 + ... + 11090.

Almost surely, 2^18268544 is an apocalyptic number.

18268544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18268544 is an abundant number, since it is smaller than the sum of its proper divisors (23327056).

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

18268544 is an equidigital number, since it uses as much as digits as its factorization.

18268544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20410 (or 20398 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The square root of 18268544 is about 4274.1717326284. The cubic root of 18268544 is about 263.3710156333.

The spelling of 18268544 in words is "eighteen million, two hundred sixty-eight thousand, five hundred forty-four".