18328680 has 80 divisors (see below), whose sum is σ = 61615620. Its totient is φ = 4886784.

The previous prime is 18328663. The next prime is 18328691. The reversal of 18328680 is 8682381.

It can be written as a sum of positive squares in 2 ways, for example, as 16695396 + 1633284 = 4086^2 + 1278^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 412 + ... + 6068.

Almost surely, 2^18328680 is an apocalyptic number.

18328680 is a gapful number since it is divisible by the number (10) 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 18328680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30807810).

18328680 is an abundant number, since it is smaller than the sum of its proper divisors (43286940).

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

18328680 is a wasteful number, since it uses less digits than its factorization.

18328680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680 (or 5667 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 18328680 is about 4281.2007661403. The cubic root of 18328680 is about 263.6596854661.

The spelling of 18328680 in words is "eighteen million, three hundred twenty-eight thousand, six hundred eighty".