6646680 has 96 divisors (see below), whose sum is σ = 22230000. Its totient is φ = 1721088.

The previous prime is 6646669. The next prime is 6646687. The reversal of 6646680 is 866466.

6646680 is a `hidden beast` number, since 6 + 646 + 6 + 8 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13071 + ... + 13569.

Almost surely, 2^6646680 is an apocalyptic number.

6646680 is a gapful number since it is divisible by the number (60) 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 6646680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11115000).

6646680 is an abundant number, since it is smaller than the sum of its proper divisors (15583320).

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

6646680 is a wasteful number, since it uses less digits than its factorization.

6646680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553 (or 546 counting only the distinct ones).

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

The square root of 6646680 is about 2578.1155908919. The cubic root of 6646680 is about 188.0189357719.

The spelling of 6646680 in words is "six million, six hundred forty-six thousand, six hundred eighty".