6666404 has 24 divisors (see below), whose sum is σ = 12209400. Its totient is φ = 3180800.

The previous prime is 6666391. The next prime is 6666437. The reversal of 6666404 is 4046666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1612900 + 5053504 = 1270^2 + 2248^2 .

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 7 ways as a sum of consecutive naturals, for example, 11432 + ... + 12000.

It is an arithmetic number, because the mean of its divisors is an integer number (508725).

Almost surely, 2^6666404 is an apocalyptic number.

It is an amenable number.

6666404 is a deficient number, since it is larger than the sum of its proper divisors (5542996).

6666404 is a wasteful number, since it uses less digits than its factorization.

6666404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 6666404 is about 2581.9380317893. The cubic root of 6666404 is about 188.2047339558.

The spelling of 6666404 in words is "six million, six hundred sixty-six thousand, four hundred four".