18128648 has 16 divisors (see below), whose sum is σ = 34039980. Its totient is φ = 9051328.

The previous prime is 18128609. The next prime is 18128687. The reversal of 18128648 is 84682181.

It is an interprime number because it is at equal distance from previous prime (18128609) and next prime (18128687).

It can be written as a sum of positive squares in 2 ways, for example, as 17322244 + 806404 = 4162^2 + 898^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6986 + ... + 9222.

Almost surely, 2^18128648 is an apocalyptic number.

It is an amenable number.

18128648 is a deficient number, since it is larger than the sum of its proper divisors (15911332).

18128648 is a wasteful number, since it uses less digits than its factorization.

18128648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256 (or 3252 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 18128648 is about 4257.7750057982. The cubic root of 18128648 is about 262.6970155124.

The spelling of 18128648 in words is "eighteen million, one hundred twenty-eight thousand, six hundred forty-eight".