6690785 has 8 divisors (see below), whose sum is σ = 8160936. Its totient is φ = 5264640.

The previous prime is 6690767. The next prime is 6690787. The reversal of 6690785 is 5870966.

It is a happy number.

6690785 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 183184 + 6507601 = 428^2 + 2551^2 .

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

It is not a de Polignac number, because 6690785 - 2⁶ = 6690721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6690787) 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, 10664 + ... + 11273.

It is an arithmetic number, because the mean of its divisors is an integer number (1020117).

Almost surely, 2^6690785 is an apocalyptic number.

It is an amenable number.

6690785 is a deficient number, since it is larger than the sum of its proper divisors (1470151).

6690785 is a wasteful number, since it uses less digits than its factorization.

6690785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22003.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 6690785 is about 2586.6551760913. The cubic root of 6690785 is about 188.4338948337.

The spelling of 6690785 in words is "six million, six hundred ninety thousand, seven hundred eighty-five".