6649680 has 80 divisors (see below), whose sum is σ = 20891520. Its totient is φ = 1749504.

The previous prime is 6649661. The next prime is 6649681. The reversal of 6649680 is 869466.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649681) 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, 24586 + ... + 24854.

It is an arithmetic number, because the mean of its divisors is an integer number (261144).

Almost surely, 2^6649680 is an apocalyptic number.

6649680 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 6649680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10445760).

6649680 is an abundant number, since it is smaller than the sum of its proper divisors (14241840).

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

6649680 is a wasteful number, since it uses less digits than its factorization.

6649680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 6649680 is about 2578.6973455604. The cubic root of 6649680 is about 188.0472191638.

The spelling of 6649680 in words is "six million, six hundred forty-nine thousand, six hundred eighty".