6688961 has 4 divisors (see below), whose sum is σ = 6703872. Its totient is φ = 6674052.

The previous prime is 6688943. The next prime is 6688967. The reversal of 6688961 is 1698866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6688961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6688967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6761 + ... + 7686.

It is an arithmetic number, because the mean of its divisors is an integer number (1675968).

Almost surely, 2^6688961 is an apocalyptic number.

It is an amenable number.

6688961 is a deficient number, since it is larger than the sum of its proper divisors (14911).

6688961 is a wasteful number, since it uses less digits than its factorization.

6688961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14910.

The product of its digits is 124416, while the sum is 44.

The square root of 6688961 is about 2586.3025731728. The cubic root of 6688961 is about 188.4167700538.

The spelling of 6688961 in words is "six million, six hundred eighty-eight thousand, nine hundred sixty-one".