6641816 has 16 divisors (see below), whose sum is σ = 12528000. Its totient is φ = 3301024.

The previous prime is 6641813. The next prime is 6641821. The reversal of 6641816 is 6181466.

It is a happy number.

It is a super-2 number, since 2×6641816² = 88227439555712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641813) 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, 1016 + ... + 3783.

It is an arithmetic number, because the mean of its divisors is an integer number (783000).

Almost surely, 2^6641816 is an apocalyptic number.

It is an amenable number.

6641816 is a deficient number, since it is larger than the sum of its proper divisors (5886184).

6641816 is a wasteful number, since it uses less digits than its factorization.

6641816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978 (or 4974 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 6641816 is about 2577.1720935941. The cubic root of 6641816 is about 187.9730608752.

The spelling of 6641816 in words is "six million, six hundred forty-one thousand, eight hundred sixteen".