6987647 has 6 divisors (see below), whose sum is σ = 7057512. Its totient is φ = 6918372.

The previous prime is 6987619. The next prime is 6987661. The reversal of 6987647 is 7467896.

It is a happy number.

It is not a de Polignac number, because 6987647 - 2⁶ = 6987583 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 (6987677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26438 + ... + 26700.

It is an arithmetic number, because the mean of its divisors is an integer number (1176252).

Almost surely, 2^6987647 is an apocalyptic number.

6987647 is a deficient number, since it is larger than the sum of its proper divisors (69865).

6987647 is an equidigital number, since it uses as much as digits as its factorization.

6987647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589 (or 426 counting only the distinct ones).

The product of its digits is 508032, while the sum is 47.

The square root of 6987647 is about 2643.4157826570. The cubic root of 6987647 is about 191.1805261207.

Subtracting 6987647 from its reverse (7467896), we obtain a square (480249 = 693²).

The spelling of 6987647 in words is "six million, nine hundred eighty-seven thousand, six hundred forty-seven".