18281828 has 24 divisors (see below), whose sum is σ = 32739672. Its totient is φ = 8930304.

The previous prime is 18281801. The next prime is 18281831. The reversal of 18281828 is 82818281.

It can be written as a sum of positive squares in 4 ways, for example, as 7139584 + 11142244 = 2672^2 + 3338^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18281791 and 18281800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39776 + ... + 40232.

It is an arithmetic number, because the mean of its divisors is an integer number (1364153).

Almost surely, 2^18281828 is an apocalyptic number.

It is an amenable number.

18281828 is a deficient number, since it is larger than the sum of its proper divisors (14457844).

18281828 is a wasteful number, since it uses less digits than its factorization.

18281828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 669 counting only the distinct ones).

The product of its digits is 16384, while the sum is 38.

The square root of 18281828 is about 4275.7254355255. The cubic root of 18281828 is about 263.4348370469.

The spelling of 18281828 in words is "eighteen million, two hundred eighty-one thousand, eight hundred twenty-eight".