6689240644 has 12 divisors (see below), whose sum is σ = 11710813968. Its totient is φ = 3343293800.

The previous prime is 6689240599. The next prime is 6689240713. The reversal of 6689240644 is 4460429866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320242 + ... + 340489.

It is an arithmetic number, because the mean of its divisors is an integer number (975901164).

Almost surely, 2^6689240644 is an apocalyptic number.

It is an amenable number.

6689240644 is a deficient number, since it is larger than the sum of its proper divisors (5021573324).

6689240644 is a wasteful number, since it uses less digits than its factorization.

6689240644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663266 (or 663264 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 49.

The square root of 6689240644 is about 81787.7780845036. The cubic root of 6689240644 is about 1884.1939571743.

The spelling of 6689240644 in words is "six billion, six hundred eighty-nine million, two hundred forty thousand, six hundred forty-four".