5643657 has 6 divisors (see below), whose sum is σ = 8151962. Its totient is φ = 3762432.

The previous prime is 5643653. The next prime is 5643667. The reversal of 5643657 is 7563465.

5643657 is a `hidden beast` number, since 5 + 643 + 6 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5308416 + 335241 = 2304^2 + 579^2 .

It is not a de Polignac number, because 5643657 - 2² = 5643653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5643653) 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 5 ways as a sum of consecutive naturals, for example, 313528 + ... + 313545.

Almost surely, 2^5643657 is an apocalyptic number.

It is an amenable number.

5643657 is a deficient number, since it is larger than the sum of its proper divisors (2508305).

5643657 is a wasteful number, since it uses less digits than its factorization.

5643657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627079 (or 627076 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 5643657 is about 2375.6382300342. The cubic root of 5643657 is about 178.0410732974.

The spelling of 5643657 in words is "five million, six hundred forty-three thousand, six hundred fifty-seven".