6987287 has 4 divisors (see below), whose sum is σ = 7018296. Its totient is φ = 6956280.

The previous prime is 6987271. The next prime is 6987293. The reversal of 6987287 is 7827896.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6987287 - 2⁴ = 6987271 is a prime.

It is a d-powerful number, because it can be written as 6⁸ + 9⁷ + 8² + 7 + 2¹⁸ + 8⁶ + 7³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6987247) 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, 15164 + ... + 15617.

It is an arithmetic number, because the mean of its divisors is an integer number (1754574).

Almost surely, 2^6987287 is an apocalyptic number.

6987287 is a deficient number, since it is larger than the sum of its proper divisors (31009).

6987287 is a wasteful number, since it uses less digits than its factorization.

6987287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31008.

The product of its digits is 338688, while the sum is 47.

The square root of 6987287 is about 2643.3476880653. The cubic root of 6987287 is about 191.1772428900.

The spelling of 6987287 in words is "six million, nine hundred eighty-seven thousand, two hundred eighty-seven".