6666408 has 64 divisors (see below), whose sum is σ = 21168000. Its totient is φ = 1904256.

The previous prime is 6666391. The next prime is 6666437. The reversal of 6666408 is 8046666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 15 ways as a sum of consecutive naturals, for example, 693 + ... + 3716.

It is an arithmetic number, because the mean of its divisors is an integer number (330750).

Almost surely, 2^6666408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10584000).

6666408 is an abundant number, since it is smaller than the sum of its proper divisors (14501592).

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

6666408 is a wasteful number, since it uses less digits than its factorization.

6666408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431 (or 4421 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 6666408 is about 2581.9388064011. The cubic root of 6666408 is about 188.2047715982.

The spelling of 6666408 in words is "six million, six hundred sixty-six thousand, four hundred eight".