6649605 has 12 divisors (see below), whose sum is σ = 11526060. Its totient is φ = 3546432.

The previous prime is 6649589. The next prime is 6649609. The reversal of 6649605 is 5069466.

It is a happy number.

6649605 is a `hidden beast` number, since 6 + 6 + 49 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1640961 + 5008644 = 1281^2 + 2238^2 .

It is not a de Polignac number, because 6649605 - 2⁴ = 6649589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6649605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73840 + ... + 73929.

It is an arithmetic number, because the mean of its divisors is an integer number (960505).

Almost surely, 2^6649605 is an apocalyptic number.

It is an amenable number.

6649605 is a deficient number, since it is larger than the sum of its proper divisors (4876455).

6649605 is a wasteful number, since it uses less digits than its factorization.

6649605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147780 (or 147777 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6649605 is about 2578.6828032932. The cubic root of 6649605 is about 188.0465121827.

The spelling of 6649605 in words is "six million, six hundred forty-nine thousand, six hundred five".