6646840 has 32 divisors (see below), whose sum is σ = 15104880. Its totient is φ = 2632192.

The previous prime is 6646837. The next prime is 6646859. The reversal of 6646840 is 486466.

It is a junction number, because it is equal to n+sod(n) for n = 6646796 and 6646805.

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, 3504 + ... + 5056.

Almost surely, 2^6646840 is an apocalyptic number.

It is an amenable number.

6646840 is an abundant number, since it is smaller than the sum of its proper divisors (8458040).

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

6646840 is a wasteful number, since it uses less digits than its factorization.

6646840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1667 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 6646840 is about 2578.1466211215. The cubic root of 6646840 is about 188.0204444343.

The spelling of 6646840 in words is "six million, six hundred forty-six thousand, eight hundred forty".