6687561 has 8 divisors (see below), whose sum is σ = 9042624. Its totient is φ = 4395440.

The previous prime is 6687557. The next prime is 6687589. The reversal of 6687561 is 1657866.

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

It is a cyclic number.

It is not a de Polignac number, because 6687561 - 2² = 6687557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6687521) 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, 15486 + ... + 15911.

It is an arithmetic number, because the mean of its divisors is an integer number (1130328).

Almost surely, 2^6687561 is an apocalyptic number.

It is an amenable number.

6687561 is a deficient number, since it is larger than the sum of its proper divisors (2355063).

6687561 is a wasteful number, since it uses less digits than its factorization.

6687561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31471.

The product of its digits is 60480, while the sum is 39.

The square root of 6687561 is about 2586.0319023554. The cubic root of 6687561 is about 188.4036239223.

The spelling of 6687561 in words is "six million, six hundred eighty-seven thousand, five hundred sixty-one".