6649805 has 8 divisors (see below), whose sum is σ = 8449272. Its totient is φ = 5006848.

The previous prime is 6649801. The next prime is 6649823. The reversal of 6649805 is 5089466.

It can be written as a sum of positive squares in 4 ways, for example, as 111556 + 6538249 = 334^2 + 2557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6649805 - 2² = 6649801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39032 + ... + 39201.

It is an arithmetic number, because the mean of its divisors is an integer number (1056159).

Almost surely, 2^6649805 is an apocalyptic number.

It is an amenable number.

6649805 is a deficient number, since it is larger than the sum of its proper divisors (1799467).

6649805 is a wasteful number, since it uses less digits than its factorization.

6649805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78255.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 6649805 is about 2578.7215824901. The cubic root of 6649805 is about 188.0483974538.

The spelling of 6649805 in words is "six million, six hundred forty-nine thousand, eight hundred five".