16640680 has 64 divisors (see below), whose sum is σ = 43280640. Its totient is φ = 5640192.

The previous prime is 16640651. The next prime is 16640681. The reversal of 16640680 is 8604661.

It is not an unprimeable number, because it can be changed into a prime (16640681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28552 + ... + 29128.

It is an arithmetic number, because the mean of its divisors is an integer number (676260).

Almost surely, 2^16640680 is an apocalyptic number.

16640680 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 16640680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21640320).

16640680 is an abundant number, since it is smaller than the sum of its proper divisors (26639960).

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

16640680 is a wasteful number, since it uses less digits than its factorization.

16640680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 16640680 is about 4079.2989593802. The cubic root of 16640680 is about 255.3036495536.

The spelling of 16640680 in words is "sixteen million, six hundred forty thousand, six hundred eighty".