18128448 has 140 divisors (see below), whose sum is σ = 58087260. Its totient is φ = 5557248.

The previous prime is 18128441. The next prime is 18128449. The reversal of 18128448 is 84482181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1871424 + 16257024 = 1368^2 + 4032^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18128441) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 67258 + ... + 67526.

It is an arithmetic number, because the mean of its divisors is an integer number (414909).

Almost surely, 2^18128448 is an apocalyptic number.

18128448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18128448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29043630).

18128448 is an abundant number, since it is smaller than the sum of its proper divisors (39958812).

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

18128448 is a wasteful number, since it uses less digits than its factorization.

18128448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 287 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 18128448 is about 4257.7515192881. The cubic root of 18128448 is about 262.6960494614.

The spelling of 18128448 in words is "eighteen million, one hundred twenty-eight thousand, four hundred forty-eight".