6640206 has 16 divisors (see below), whose sum is σ = 13405824. Its totient is φ = 2192504.

The previous prime is 6640181. The next prime is 6640213. The reversal of 6640206 is 6020466.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 4530 + ... + 5813.

It is an arithmetic number, because the mean of its divisors is an integer number (837864).

Almost surely, 2^6640206 is an apocalyptic number.

6640206 is an abundant number, since it is smaller than the sum of its proper divisors (6765618).

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

6640206 is a wasteful number, since it uses less digits than its factorization.

6640206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10455.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 6640206 is about 2576.8597167871. The cubic root of 6640206 is about 187.9578711999.

The spelling of 6640206 in words is "six million, six hundred forty thousand, two hundred six".