5781647 has 4 divisors (see below), whose sum is σ = 5820600. Its totient is φ = 5742696.

The previous prime is 5781637. The next prime is 5781653. The reversal of 5781647 is 7461875.

5781647 is nontrivially palindromic in base 11.

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 5781647 - 2¹⁰ = 5780623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5781647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5781637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19253 + ... + 19550.

It is an arithmetic number, because the mean of its divisors is an integer number (1455150).

Almost surely, 2^5781647 is an apocalyptic number.

5781647 is a deficient number, since it is larger than the sum of its proper divisors (38953).

5781647 is a wasteful number, since it uses less digits than its factorization.

5781647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38952.

The product of its digits is 47040, while the sum is 38.

The square root of 5781647 is about 2404.5055624806. The cubic root of 5781647 is about 179.4804669377.

The spelling of 5781647 in words is "five million, seven hundred eighty-one thousand, six hundred forty-seven".