6691684 has 6 divisors (see below), whose sum is σ = 11710454. Its totient is φ = 3345840.

The previous prime is 6691661. The next prime is 6691687. The reversal of 6691684 is 4861966.

6691684 is nontrivially palindromic in base 3.

It can be written as a sum of positive squares in only one way, i.e., 5198400 + 1493284 = 2280^2 + 1222^2 .

It is not an unprimeable number, because it can be changed into a prime (6691687) by changing a digit.

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 as a sum of consecutive naturals, namely, 836457 + ... + 836464.

Almost surely, 2^6691684 is an apocalyptic number.

It is an amenable number.

6691684 is a deficient number, since it is larger than the sum of its proper divisors (5018770).

6691684 is a wasteful number, since it uses less digits than its factorization.

6691684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672925 (or 1672923 counting only the distinct ones).

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

The square root of 6691684 is about 2586.8289467995. The cubic root of 6691684 is about 188.4423340271.

The spelling of 6691684 in words is "six million, six hundred ninety-one thousand, six hundred eighty-four".