6687657 has 8 divisors (see below), whose sum is σ = 9907680. Its totient is φ = 4458420.

The previous prime is 6687631. The next prime is 6687689. The reversal of 6687657 is 7567866.

It is not a de Polignac number, because 6687657 - 2⁷ = 6687529 is a prime.

It is a super-2 number, since 2×6687657² = 89449512299298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6687617) 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 7 ways as a sum of consecutive naturals, for example, 123819 + ... + 123872.

It is an arithmetic number, because the mean of its divisors is an integer number (1238460).

Almost surely, 2^6687657 is an apocalyptic number.

It is an amenable number.

6687657 is a deficient number, since it is larger than the sum of its proper divisors (3220023).

6687657 is a wasteful number, since it uses less digits than its factorization.

6687657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247700 (or 247694 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 6687657 is about 2586.0504635447. The cubic root of 6687657 is about 188.4045254299.

The spelling of 6687657 in words is "six million, six hundred eighty-seven thousand, six hundred fifty-seven".