6689761 has 8 divisors (see below), whose sum is σ = 7234920. Its totient is φ = 6148992.

The previous prime is 6689741. The next prime is 6689773. The reversal of 6689761 is 1679866.

It can be written as a sum of positive squares in 4 ways, for example, as 136161 + 6553600 = 369^2 + 2560^2 .

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 6689761 - 2¹⁷ = 6558689 is a prime.

It is a Duffinian number.

6689761 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2541 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (904365).

Almost surely, 2^6689761 is an apocalyptic number.

It is an amenable number.

6689761 is a deficient number, since it is larger than the sum of its proper divisors (545159).

6689761 is a wasteful number, since it uses less digits than its factorization.

6689761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195.

The product of its digits is 108864, while the sum is 43.

The square root of 6689761 is about 2586.4572294937. The cubic root of 6689761 is about 188.4242813054.

The spelling of 6689761 in words is "six million, six hundred eighty-nine thousand, seven hundred sixty-one".