18557648 has 10 divisors (see below), whose sum is σ = 35955474. Its totient is φ = 9278816.

The previous prime is 18557641. The next prime is 18557663. The reversal of 18557648 is 84675581.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12759184 + 5798464 = 3572^2 + 2408^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18557599 and 18557608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18557641) 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 as a sum of consecutive naturals, namely, 579911 + ... + 579942.

Almost surely, 2^18557648 is an apocalyptic number.

It is an amenable number.

18557648 is a deficient number, since it is larger than the sum of its proper divisors (17397826).

18557648 is a wasteful number, since it uses less digits than its factorization.

18557648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159861 (or 1159855 counting only the distinct ones).

The product of its digits is 268800, while the sum is 44.

The square root of 18557648 is about 4307.8588649119. The cubic root of 18557648 is about 264.7530534420.

The spelling of 18557648 in words is "eighteen million, five hundred fifty-seven thousand, six hundred forty-eight".