6687745 has 8 divisors (see below), whose sum is σ = 8127360. Its totient is φ = 5282160.

The previous prime is 6687701. The next prime is 6687757. The reversal of 6687745 is 5477866.

6687745 = T₁₀₉ + T₁₁₀ + ... + T₃₄₅.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6687745 - 2⁷ = 6687617 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 8071 + ... + 8860.

It is an arithmetic number, because the mean of its divisors is an integer number (1015920).

Almost surely, 2^6687745 is an apocalyptic number.

It is an amenable number.

6687745 is a deficient number, since it is larger than the sum of its proper divisors (1439615).

6687745 is a wasteful number, since it uses less digits than its factorization.

6687745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17015.

The product of its digits is 282240, while the sum is 43.

The square root of 6687745 is about 2586.0674778513. The cubic root of 6687745 is about 188.4053518043.

The spelling of 6687745 in words is "six million, six hundred eighty-seven thousand, seven hundred forty-five".