6689408 has 32 divisors (see below), whose sum is σ = 14541120. Its totient is φ = 3040000.

The previous prime is 6689399. The next prime is 6689413. The reversal of 6689408 is 8049866.

It is a tau number, because it is divible by the number of its divisors (32).

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968 + ... + 3783.

It is an arithmetic number, because the mean of its divisors is an integer number (454410).

Almost surely, 2^6689408 is an apocalyptic number.

It is an amenable number.

6689408 is an abundant number, since it is smaller than the sum of its proper divisors (7851712).

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

6689408 is a wasteful number, since it uses less digits than its factorization.

6689408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4776 (or 4764 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 6689408 is about 2586.3889885321. The cubic root of 6689408 is about 188.4209670395.

The spelling of 6689408 in words is "six million, six hundred eighty-nine thousand, four hundred eight".