6690605 has 8 divisors (see below), whose sum is σ = 8501112. Its totient is φ = 5037568.

The previous prime is 6690601. The next prime is 6690611. The reversal of 6690605 is 5060966.

6690605 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1898884 + 4791721 = 1378^2 + 2189^2 .

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 6690605 - 2² = 6690601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690601) 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, 39272 + ... + 39441.

It is an arithmetic number, because the mean of its divisors is an integer number (1062639).

Almost surely, 2^6690605 is an apocalyptic number.

It is an amenable number.

6690605 is a deficient number, since it is larger than the sum of its proper divisors (1810507).

6690605 is a wasteful number, since it uses less digits than its factorization.

6690605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78735.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 6690605 is about 2586.6203818883. The cubic root of 6690605 is about 188.4322050267.

The spelling of 6690605 in words is "six million, six hundred ninety thousand, six hundred five".