6647487 has 24 divisors (see below), whose sum is σ = 11250432. Its totient is φ = 3452400.

The previous prime is 6647447. The next prime is 6647489. The reversal of 6647487 is 7847466.

It is not a de Polignac number, because 6647487 - 2¹⁵ = 6614719 is a prime.

6647487 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 439 + ... + 3672.

It is an arithmetic number, because the mean of its divisors is an integer number (468768).

Almost surely, 2^6647487 is an apocalyptic number.

6647487 is a deficient number, since it is larger than the sum of its proper divisors (4602945).

6647487 is a wasteful number, since it uses less digits than its factorization.

6647487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139 (or 4132 counting only the distinct ones).

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

The square root of 6647487 is about 2578.2720958037. The cubic root of 6647487 is about 188.0265448409.

The spelling of 6647487 in words is "six million, six hundred forty-seven thousand, four hundred eighty-seven".