6640517 has 6 divisors (see below), whose sum is σ = 7190802. Its totient is φ = 6129552.

The previous prime is 6640511. The next prime is 6640547. The reversal of 6640517 is 7150466.

It can be written as a sum of positive squares in 3 ways, for example, as 519841 + 6120676 = 721^2 + 2474^2 .

It is not a de Polignac number, because 6640517 - 2⁶ = 6640453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6640517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640511) 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 5 ways as a sum of consecutive naturals, for example, 19478 + ... + 19815.

It is an arithmetic number, because the mean of its divisors is an integer number (1198467).

Almost surely, 2^6640517 is an apocalyptic number.

It is an amenable number.

6640517 is a deficient number, since it is larger than the sum of its proper divisors (550285).

6640517 is a wasteful number, since it uses less digits than its factorization.

6640517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39319 (or 39306 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 6640517 is about 2576.9200608478. The cubic root of 6640517 is about 187.9608055459.

The spelling of 6640517 in words is "six million, six hundred forty thousand, five hundred seventeen".