5665647 has 16 divisors (see below), whose sum is σ = 8291808. Its totient is φ = 3419520.

The previous prime is 5665631. The next prime is 5665661. The reversal of 5665647 is 7465665.

It is not a de Polignac number, because 5665647 - 2⁴ = 5665631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665687) 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, 697 + ... + 3437.

It is an arithmetic number, because the mean of its divisors is an integer number (518238).

Almost surely, 2^5665647 is an apocalyptic number.

5665647 is a deficient number, since it is larger than the sum of its proper divisors (2626161).

5665647 is a wasteful number, since it uses less digits than its factorization.

5665647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810.

The product of its digits is 151200, while the sum is 39.

The square root of 5665647 is about 2380.2619603733. The cubic root of 5665647 is about 178.2720139331.

It can be divided in two parts, 56 and 65647, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 5665647 in words is "five million, six hundred sixty-five thousand, six hundred forty-seven".