6680664 has 64 divisors (see below), whose sum is σ = 18770400. Its totient is φ = 2201472.

The previous prime is 6680657. The next prime is 6680689. The reversal of 6680664 is 4660866.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33814 + ... + 34010.

Almost surely, 2^6680664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6680664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9385200).

6680664 is an abundant number, since it is smaller than the sum of its proper divisors (12089736).

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

6680664 is a wasteful number, since it uses less digits than its factorization.

6680664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 6680664 is about 2584.6980481286. The cubic root of 6680664 is about 188.3388336469.

The spelling of 6680664 in words is "six million, six hundred eighty thousand, six hundred sixty-four".