18613328 has 10 divisors (see below), whose sum is σ = 36063354. Its totient is φ = 9306656.

The previous prime is 18613327. The next prime is 18613339. The reversal of 18613328 is 82331681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10705984 + 7907344 = 3272^2 + 2812^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18613294 and 18613303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18613327) by changing a digit.

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 as a sum of consecutive naturals, namely, 581651 + ... + 581682.

Almost surely, 2^18613328 is an apocalyptic number.

It is an amenable number.

18613328 is a deficient number, since it is larger than the sum of its proper divisors (17450026).

18613328 is a wasteful number, since it uses less digits than its factorization.

18613328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163341 (or 1163335 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 18613328 is about 4314.3166318665. The cubic root of 18613328 is about 265.0175756707.

The spelling of 18613328 in words is "eighteen million, six hundred thirteen thousand, three hundred twenty-eight".