6689745 has 24 divisors (see below), whose sum is σ = 11846016. Its totient is φ = 3490848.

The previous prime is 6689741. The next prime is 6689773. The reversal of 6689745 is 5479866.

It is not a de Polignac number, because 6689745 - 2² = 6689741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6689745.

It is not an unprimeable number, because it can be changed into a prime (6689741) 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 in 23 ways as a sum of consecutive naturals, for example, 534 + ... + 3696.

It is an arithmetic number, because the mean of its divisors is an integer number (493584).

Almost surely, 2^6689745 is an apocalyptic number.

It is an amenable number.

6689745 is a deficient number, since it is larger than the sum of its proper divisors (5156271).

6689745 is a wasteful number, since it uses less digits than its factorization.

6689745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3221 (or 3218 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 6689745 is about 2586.4541364579. The cubic root of 6689745 is about 188.4241310862.

The spelling of 6689745 in words is "six million, six hundred eighty-nine thousand, seven hundred forty-five".