6690805 has 16 divisors (see below), whose sum is σ = 8812800. Its totient is φ = 4836160.

The previous prime is 6690797. The next prime is 6690829. The reversal of 6690805 is 5080966.

It is not a de Polignac number, because 6690805 - 2³ = 6690797 is a prime.

6690805 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12891 + ... + 13399.

It is an arithmetic number, because the mean of its divisors is an integer number (550800).

Almost surely, 2^6690805 is an apocalyptic number.

It is an amenable number.

6690805 is a deficient number, since it is larger than the sum of its proper divisors (2121995).

6690805 is a wasteful number, since it uses less digits than its factorization.

6690805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 6690805 is about 2586.6590420850. The cubic root of 6690805 is about 188.4340825882.

The spelling of 6690805 in words is "six million, six hundred ninety thousand, eight hundred five".