6688489 has 4 divisors (see below), whose sum is σ = 6720400. Its totient is φ = 6656580.

The previous prime is 6688481. The next prime is 6688499. The reversal of 6688489 is 9848866.

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 not a de Polignac number, because 6688489 - 2³ = 6688481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6688481) 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, 15639 + ... + 16060.

It is an arithmetic number, because the mean of its divisors is an integer number (1680100).

Almost surely, 2^6688489 is an apocalyptic number.

It is an amenable number.

6688489 is a deficient number, since it is larger than the sum of its proper divisors (31911).

6688489 is a wasteful number, since it uses less digits than its factorization.

6688489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31910.

The product of its digits is 663552, while the sum is 49.

The square root of 6688489 is about 2586.2113216054. The cubic root of 6688489 is about 188.4123381344.

The spelling of 6688489 in words is "six million, six hundred eighty-eight thousand, four hundred eighty-nine".