6688389 has 8 divisors (see below), whose sum is σ = 9025632. Its totient is φ = 4405040.

The previous prime is 6688387. The next prime is 6688393. The reversal of 6688389 is 9838866.

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 6688389 - 2¹ = 6688387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688387) 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, 13182 + ... + 13679.

It is an arithmetic number, because the mean of its divisors is an integer number (1128204).

Almost surely, 2^6688389 is an apocalyptic number.

It is an amenable number.

6688389 is a deficient number, since it is larger than the sum of its proper divisors (2337243).

6688389 is a wasteful number, since it uses less digits than its factorization.

6688389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26947.

The product of its digits is 497664, while the sum is 48.

The square root of 6688389 is about 2586.1919882329. The cubic root of 6688389 is about 188.4113991417.

The spelling of 6688389 in words is "six million, six hundred eighty-eight thousand, three hundred eighty-nine".