6640366 has 8 divisors (see below), whose sum is σ = 10000080. Its totient is φ = 3307008.

The previous prime is 6640349. The next prime is 6640369. The reversal of 6640366 is 6630466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6640366² = 88188921227912, which contains 22 as substring.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5946 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (1250010).

Almost surely, 2^6640366 is an apocalyptic number.

6640366 is a deficient number, since it is larger than the sum of its proper divisors (3359714).

6640366 is a wasteful number, since it uses less digits than its factorization.

6640366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13178.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 6640366 is about 2576.8907621395. The cubic root of 6640366 is about 187.9593808427.

The spelling of 6640366 in words is "six million, six hundred forty thousand, three hundred sixty-six".