16680400 has 120 divisors (see below), whose sum is σ = 46497024. Its totient is φ = 5683200.

The previous prime is 16680373. The next prime is 16680403. The reversal of 16680400 is 408661.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16680403) 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 23 ways as a sum of consecutive naturals, for example, 74689 + ... + 74911.

Almost surely, 2^16680400 is an apocalyptic number.

16680400 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 16680400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23248512).

16680400 is an abundant number, since it is smaller than the sum of its proper divisors (29816624).

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

16680400 is a wasteful number, since it uses less digits than its factorization.

16680400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 16680400 is about 4084.1645412495. The cubic root of 16680400 is about 255.5066180886.

The spelling of 16680400 in words is "sixteen million, six hundred eighty thousand, four hundred".