6887661 has 16 divisors (see below), whose sum is σ = 10291008. Its totient is φ = 4060800.

The previous prime is 6887627. The next prime is 6887663. The reversal of 6887661 is 1667886.

It is not a de Polignac number, because 6887661 - 2⁹ = 6887149 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6887663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1600 + ... + 4041.

It is an arithmetic number, because the mean of its divisors is an integer number (643188).

Almost surely, 2^6887661 is an apocalyptic number.

It is an amenable number.

6887661 is a deficient number, since it is larger than the sum of its proper divisors (3403347).

6887661 is a wasteful number, since it uses less digits than its factorization.

6887661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5692.

The product of its digits is 96768, while the sum is 42.

The square root of 6887661 is about 2624.4353678458. The cubic root of 6887661 is about 190.2642767451.

The spelling of 6887661 in words is "six million, eight hundred eighty-seven thousand, six hundred sixty-one".