5665881 has 16 divisors (see below), whose sum is σ = 8205120. Its totient is φ = 3456960.

The previous prime is 5665853. The next prime is 5665883. The reversal of 5665881 is 1885665.

It is not a de Polignac number, because 5665881 - 2²¹ = 3568729 is a prime.

It is a super-2 number, since 2×5665881² = 64204415012322, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665883) 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, 4555 + ... + 5663.

It is an arithmetic number, because the mean of its divisors is an integer number (512820).

Almost surely, 2^5665881 is an apocalyptic number.

It is an amenable number.

5665881 is a deficient number, since it is larger than the sum of its proper divisors (2539239).

5665881 is a wasteful number, since it uses less digits than its factorization.

5665881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256.

The product of its digits is 57600, while the sum is 39.

The square root of 5665881 is about 2380.3111141193. The cubic root of 5665881 is about 178.2744682028.

The spelling of 5665881 in words is "five million, six hundred sixty-five thousand, eight hundred eighty-one".