6649040 has 40 divisors (see below), whose sum is σ = 16371720. Its totient is φ = 2502656.

The previous prime is 6649007. The next prime is 6649063. The reversal of 6649040 is 409466.

It can be written as a sum of positive squares in 4 ways, for example, as 1948816 + 4700224 = 1396^2 + 2168^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 6648994 and 6649012.

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 7 ways as a sum of consecutive naturals, for example, 1085 + ... + 3804.

It is an arithmetic number, because the mean of its divisors is an integer number (409293).

Almost surely, 2^6649040 is an apocalyptic number.

It is an amenable number.

6649040 is an abundant number, since it is smaller than the sum of its proper divisors (9722680).

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

6649040 is a wasteful number, since it uses less digits than its factorization.

6649040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919 (or 4913 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 6649040 is about 2578.5732489111. The cubic root of 6649040 is about 188.0411860874.

The spelling of 6649040 in words is "six million, six hundred forty-nine thousand, forty".