6687447 has 8 divisors (see below), whose sum is σ = 9602544. Its totient is φ = 4115328.

The previous prime is 6687437. The next prime is 6687451. The reversal of 6687447 is 7447866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6687447 - 2⁶ = 6687383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6687399 and 6687408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85698 + ... + 85775.

It is an arithmetic number, because the mean of its divisors is an integer number (1200318).

Almost surely, 2^6687447 is an apocalyptic number.

6687447 is a deficient number, since it is larger than the sum of its proper divisors (2915097).

6687447 is a wasteful number, since it uses less digits than its factorization.

6687447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171489.

The product of its digits is 225792, while the sum is 42.

The square root of 6687447 is about 2586.0098607701. The cubic root of 6687447 is about 188.4025533708.

The spelling of 6687447 in words is "six million, six hundred eighty-seven thousand, four hundred forty-seven".