18306680 has 32 divisors (see below), whose sum is σ = 47075040. Its totient is φ = 6276480.

The previous prime is 18306661. The next prime is 18306719. The reversal of 18306680 is 8660381.

It is a congruent number.

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, 32411 + ... + 32970.

It is an arithmetic number, because the mean of its divisors is an integer number (1471095).

Almost surely, 2^18306680 is an apocalyptic number.

18306680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18306680 is an abundant number, since it is smaller than the sum of its proper divisors (28768360).

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

18306680 is a wasteful number, since it uses less digits than its factorization.

18306680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65399 (or 65395 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 18306680 is about 4278.6306220565. The cubic root of 18306680 is about 263.5541525813.

The spelling of 18306680 in words is "eighteen million, three hundred six thousand, six hundred eighty".