5665816 has 32 divisors (see below), whose sum is σ = 11546640. Its totient is φ = 2590848.

The previous prime is 5665789. The next prime is 5665837. The reversal of 5665816 is 6185665.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16155 + ... + 16501.

Almost surely, 2^5665816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5665816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5773320).

5665816 is an abundant number, since it is smaller than the sum of its proper divisors (5880824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5665816 is a wasteful number, since it uses less digits than its factorization.

5665816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 519 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 5665816 is about 2380.2974604028. The cubic root of 5665816 is about 178.2737864680.

The spelling of 5665816 in words is "five million, six hundred sixty-five thousand, eight hundred sixteen".