6657864 has 16 divisors (see below), whose sum is σ = 16644720. Its totient is φ = 2219280.

The previous prime is 6657853. The next prime is 6657881. The reversal of 6657864 is 4687566.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138682 + ... + 138729.

It is an arithmetic number, because the mean of its divisors is an integer number (1040295).

Almost surely, 2^6657864 is an apocalyptic number.

It is an amenable number.

6657864 is an abundant number, since it is smaller than the sum of its proper divisors (9986856).

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

6657864 is a wasteful number, since it uses less digits than its factorization.

6657864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277420 (or 277416 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 6657864 is about 2580.2837053316. The cubic root of 6657864 is about 188.1243330256.

The spelling of 6657864 in words is "six million, six hundred fifty-seven thousand, eight hundred sixty-four".