18320628 has 48 divisors (see below), whose sum is σ = 46738944. Its totient is φ = 5560320.

The previous prime is 18320609. The next prime is 18320629. The reversal of 18320628 is 82602381.

It is a junction number, because it is equal to n+sod(n) for n = 18320595 and 18320604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18320629) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4876 + ... + 7772.

It is an arithmetic number, because the mean of its divisors is an integer number (973728).

Almost surely, 2^18320628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18320628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23369472).

18320628 is an abundant number, since it is smaller than the sum of its proper divisors (28418316).

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

18320628 is a wasteful number, since it uses less digits than its factorization.

18320628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952 (or 2950 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18320628 is about 4280.2602724601. The cubic root of 18320628 is about 263.6210702331.

The spelling of 18320628 in words is "eighteen million, three hundred twenty thousand, six hundred twenty-eight".