6686424 has 24 divisors (see below), whose sum is σ = 18109260. Its totient is φ = 2228784.

The previous prime is 6686419. The next prime is 6686437. The reversal of 6686424 is 4246866.

It is a happy number.

6686424 is a `hidden beast` number, since 6 + 6 + 8 + 642 + 4 = 666.

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 (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46362 + ... + 46505.

Almost surely, 2^6686424 is an apocalyptic number.

It is an amenable number.

6686424 is an abundant number, since it is smaller than the sum of its proper divisors (11422836).

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

6686424 is a wasteful number, since it uses less digits than its factorization.

6686424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92879 (or 92872 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 6686424 is about 2585.8120581357. The cubic root of 6686424 is about 188.3929460353.

It can be divided in two parts, 66864 and 24, that multiplied together give a triangular number (1604736 = T₁₇₉₁).

The spelling of 6686424 in words is "six million, six hundred eighty-six thousand, four hundred twenty-four".