6387665 has 8 divisors (see below), whose sum is σ = 8116200. Its totient is φ = 4809472.

The previous prime is 6387653. The next prime is 6387673. The reversal of 6387665 is 5667836.

It can be written as a sum of positive squares in 4 ways, for example, as 117649 + 6270016 = 343^2 + 2504^2 .

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 6387665 - 2⁴ = 6387649 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 37490 + ... + 37659.

It is an arithmetic number, because the mean of its divisors is an integer number (1014525).

Almost surely, 2^6387665 is an apocalyptic number.

It is an amenable number.

6387665 is a deficient number, since it is larger than the sum of its proper divisors (1728535).

6387665 is a wasteful number, since it uses less digits than its factorization.

6387665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75171.

The product of its digits is 181440, while the sum is 41.

The square root of 6387665 is about 2527.3830338910. The cubic root of 6387665 is about 185.5441974687.

The spelling of 6387665 in words is "six million, three hundred eighty-seven thousand, six hundred sixty-five".