6640305 has 16 divisors (see below), whose sum is σ = 12142464. Its totient is φ = 3035520.

The previous prime is 6640297. The next prime is 6640321. The reversal of 6640305 is 5030466.

It is not a de Polignac number, because 6640305 - 2³ = 6640297 is a prime.

6640305 is a lucky 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 15 ways as a sum of consecutive naturals, for example, 31516 + ... + 31725.

It is an arithmetic number, because the mean of its divisors is an integer number (758904).

Almost surely, 2^6640305 is an apocalyptic number.

It is an amenable number.

6640305 is a deficient number, since it is larger than the sum of its proper divisors (5502159).

6640305 is a wasteful number, since it uses less digits than its factorization.

6640305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63256.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 6640305 is about 2576.8789261430. The cubic root of 6640305 is about 187.9588052942.

The spelling of 6640305 in words is "six million, six hundred forty thousand, three hundred five".