5640866 has 16 divisors (see below), whose sum is σ = 10549440. Its totient is φ = 2197680.

The previous prime is 5640863. The next prime is 5640871. The reversal of 5640866 is 6680465.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5640863) 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, 18161 + ... + 18468.

It is an arithmetic number, because the mean of its divisors is an integer number (659340).

Almost surely, 2^5640866 is an apocalyptic number.

5640866 is a deficient number, since it is larger than the sum of its proper divisors (4908574).

5640866 is a wasteful number, since it uses less digits than its factorization.

5640866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36649.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 5640866 is about 2375.0507363002. The cubic root of 5640866 is about 178.0117191291.

The spelling of 5640866 in words is "five million, six hundred forty thousand, eight hundred sixty-six".