18664548 has 24 divisors (see below), whose sum is σ = 49772352. Its totient is φ = 5332704.

The previous prime is 18664543. The next prime is 18664561. The reversal of 18664548 is 84546681.

It is a super-4 number, since 4×18664548⁴ (a number of 30 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (18664543) 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 7 ways as a sum of consecutive naturals, for example, 111015 + ... + 111182.

It is an arithmetic number, because the mean of its divisors is an integer number (2073848).

Almost surely, 2^18664548 is an apocalyptic number.

It is an amenable number.

18664548 is an abundant number, since it is smaller than the sum of its proper divisors (31107804).

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

18664548 is a wasteful number, since it uses less digits than its factorization.

18664548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222211 (or 222209 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The square root of 18664548 is about 4320.2486039579. The cubic root of 18664548 is about 265.2604440802.

The spelling of 18664548 in words is "eighteen million, six hundred sixty-four thousand, five hundred forty-eight".