6666864 has 20 divisors (see below), whose sum is σ = 17222856. Its totient is φ = 2222272.

The previous prime is 6666841. The next prime is 6666883. The reversal of 6666864 is 4686666.

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 3 ways as a sum of consecutive naturals, for example, 69399 + ... + 69494.

Almost surely, 2^6666864 is an apocalyptic number.

It is an amenable number.

6666864 is an abundant number, since it is smaller than the sum of its proper divisors (10555992).

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

6666864 is a wasteful number, since it uses less digits than its factorization.

6666864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138904 (or 138898 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 6666864 is about 2582.0271106245. The cubic root of 6666864 is about 188.2090627356.

The spelling of 6666864 in words is "six million, six hundred sixty-six thousand, eight hundred sixty-four".