6691864 has 16 divisors (see below), whose sum is σ = 12574800. Its totient is φ = 3338592.

The previous prime is 6691859. The next prime is 6691891. The reversal of 6691864 is 4681966.

It is a zygodrome in base 2.

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, 6214 + ... + 7210.

It is an arithmetic number, because the mean of its divisors is an integer number (785925).

Almost surely, 2^6691864 is an apocalyptic number.

It is an amenable number.

6691864 is a deficient number, since it is larger than the sum of its proper divisors (5882936).

6691864 is a wasteful number, since it uses less digits than its factorization.

6691864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842 (or 1838 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 6691864 is about 2586.8637381973. The cubic root of 6691864 is about 188.4440236524. Note that the first 3 decimals are identical.

The spelling of 6691864 in words is "six million, six hundred ninety-one thousand, eight hundred sixty-four".