6640368 has 40 divisors (see below), whose sum is σ = 19605888. Its totient is φ = 1897152.

The previous prime is 6640349. The next prime is 6640369. The reversal of 6640368 is 8630466.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640369) by changing a digit.

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, 9546 + ... + 10217.

Almost surely, 2^6640368 is an apocalyptic number.

It is an amenable number.

6640368 is an abundant number, since it is smaller than the sum of its proper divisors (12965520).

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

6640368 is a wasteful number, since it uses less digits than its factorization.

6640368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19781 (or 19775 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 6640368 is about 2576.8911502041. The cubic root of 6640368 is about 187.9593997131.

The spelling of 6640368 in words is "six million, six hundred forty thousand, three hundred sixty-eight".