16680000 has 140 divisors (see below), whose sum is σ = 55544720. Its totient is φ = 4416000.

The previous prime is 16679987. The next prime is 16680019. The reversal of 16680000 is 8661.

It is a nialpdrome in base 16.

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, 119931 + ... + 120069.

It is an arithmetic number, because the mean of its divisors is an integer number (396748).

Almost surely, 2^16680000 is an apocalyptic number.

16680000 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 16680000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27772360).

16680000 is an abundant number, since it is smaller than the sum of its proper divisors (38864720).

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

16680000 is an equidigital number, since it uses as much as digits as its factorization.

16680000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 16680000 is about 4084.1155713324. The cubic root of 16680000 is about 255.5045757022.

Adding to 16680000 its reverse (8661), we get a palindrome (16688661).

The spelling of 16680000 in words is "sixteen million, six hundred eighty thousand".