6686688 has 24 divisors (see below), whose sum is σ = 17552808. Its totient is φ = 2228864.

The previous prime is 6686681. The next prime is 6686699. The reversal of 6686688 is 8866866.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686681) 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, 34731 + ... + 34922.

It is an arithmetic number, because the mean of its divisors is an integer number (731367).

Almost surely, 2^6686688 is an apocalyptic number.

It is an amenable number.

6686688 is an abundant number, since it is smaller than the sum of its proper divisors (10866120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6686688 is a wasteful number, since it uses less digits than its factorization.

6686688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69666 (or 69658 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 6686688 is about 2585.8631054253. The cubic root of 6686688 is about 188.3954254415.

The spelling of 6686688 in words is "six million, six hundred eighty-six thousand, six hundred eighty-eight".