6687659 has 8 divisors (see below), whose sum is σ = 7318080. Its totient is φ = 6061000.

The previous prime is 6687631. The next prime is 6687689. The reversal of 6687659 is 9567866.

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

It is not a de Polignac number, because 6687659 - 2²⁰ = 5639083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6687689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3884 + ... + 5334.

It is an arithmetic number, because the mean of its divisors is an integer number (914760).

Almost surely, 2^6687659 is an apocalyptic number.

6687659 is a deficient number, since it is larger than the sum of its proper divisors (630421).

6687659 is a wasteful number, since it uses less digits than its factorization.

6687659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881.

The product of its digits is 544320, while the sum is 47.

The square root of 6687659 is about 2586.0508502348. The cubic root of 6687659 is about 188.4045442112.

The spelling of 6687659 in words is "six million, six hundred eighty-seven thousand, six hundred fifty-nine".