6988687 has 4 divisors (see below), whose sum is σ = 6996600. Its totient is φ = 6980776.

The previous prime is 6988669. The next prime is 6988691. The reversal of 6988687 is 7868896.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6988687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6988607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2437 + ... + 4462.

It is an arithmetic number, because the mean of its divisors is an integer number (1749150).

Almost surely, 2^6988687 is an apocalyptic number.

6988687 is a deficient number, since it is larger than the sum of its proper divisors (7913).

6988687 is a wasteful number, since it uses less digits than its factorization.

6988687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7912.

The product of its digits is 1161216, while the sum is 52.

The square root of 6988687 is about 2643.6124905137. The cubic root of 6988687 is about 191.1900103760.

The spelling of 6988687 in words is "six million, nine hundred eighty-eight thousand, six hundred eighty-seven".