16611680 has 48 divisors (see below), whose sum is σ = 40098240. Its totient is φ = 6503296.

The previous prime is 16611641. The next prime is 16611689. The reversal of 16611680 is 8611661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16611689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353417 + ... + 353463.

It is an arithmetic number, because the mean of its divisors is an integer number (835380).

Almost surely, 2^16611680 is an apocalyptic number.

16611680 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 16611680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20049120).

16611680 is an abundant number, since it is smaller than the sum of its proper divisors (23486560).

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

16611680 is an frugal number, since it uses more digits than its factorization.

16611680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16611680 is about 4075.7428770716. The cubic root of 16611680 is about 255.1552559599.

The spelling of 16611680 in words is "sixteen million, six hundred eleven thousand, six hundred eighty".