6649880 has 16 divisors (see below), whose sum is σ = 14962320. Its totient is φ = 2659936.

The previous prime is 6649871. The next prime is 6649883. The reversal of 6649880 is 889466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83084 + ... + 83163.

It is an arithmetic number, because the mean of its divisors is an integer number (935145).

Almost surely, 2^6649880 is an apocalyptic number.

It is an amenable number.

6649880 is an abundant number, since it is smaller than the sum of its proper divisors (8312440).

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

6649880 is a wasteful number, since it uses less digits than its factorization.

6649880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166258 (or 166254 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 6649880 is about 2578.7361245385. The cubic root of 6649880 is about 188.0491044207.

The spelling of 6649880 in words is "six million, six hundred forty-nine thousand, eight hundred eighty".