6640329 has 16 divisors (see below), whose sum is σ = 9423680. Its totient is φ = 4147200.

The previous prime is 6640327. The next prime is 6640331. The reversal of 6640329 is 9230466.

It is an interprime number because it is at equal distance from previous prime (6640327) and next prime (6640331).

It is not a de Polignac number, because 6640329 - 2¹ = 6640327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6640296 and 6640305.

It is not an unprimeable number, because it can be changed into a prime (6640321) 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 15 ways as a sum of consecutive naturals, for example, 4929 + ... + 6129.

It is an arithmetic number, because the mean of its divisors is an integer number (588980).

Almost surely, 2^6640329 is an apocalyptic number.

It is an amenable number.

6640329 is a deficient number, since it is larger than the sum of its proper divisors (2783351).

6640329 is a wasteful number, since it uses less digits than its factorization.

6640329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 6640329 is about 2576.8835829350. The cubic root of 6640329 is about 187.9590317400.

The spelling of 6640329 in words is "six million, six hundred forty thousand, three hundred twenty-nine".