6681647 has 16 divisors (see below), whose sum is σ = 8085504. Its totient is φ = 5400000.

The previous prime is 6681637. The next prime is 6681671. The reversal of 6681647 is 7461866.

It is a cyclic number.

It is not a de Polignac number, because 6681647 - 2¹⁸ = 6419503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6681647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681637) 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, 8522 + ... + 9272.

It is an arithmetic number, because the mean of its divisors is an integer number (505344).

Almost surely, 2^6681647 is an apocalyptic number.

6681647 is a deficient number, since it is larger than the sum of its proper divisors (1403857).

6681647 is a wasteful number, since it uses less digits than its factorization.

6681647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830.

The product of its digits is 48384, while the sum is 38.

The square root of 6681647 is about 2584.8881987428. Note that the first 3 decimals coincide. The cubic root of 6681647 is about 188.3480706526.

The spelling of 6681647 in words is "six million, six hundred eighty-one thousand, six hundred forty-seven".