5643660 has 96 divisors (see below), whose sum is σ = 18289152. Its totient is φ = 1285120.

The previous prime is 5643653. The next prime is 5643667. The reversal of 5643660 is 663465.

It is an interprime number because it is at equal distance from previous prime (5643653) and next prime (5643667).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5643667) 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 31 ways as a sum of consecutive naturals, for example, 10969 + ... + 11471.

It is an arithmetic number, because the mean of its divisors is an integer number (190512).

Almost surely, 2^5643660 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 5643660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9144576).

5643660 is an abundant number, since it is smaller than the sum of its proper divisors (12645492).

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

5643660 is a wasteful number, since it uses less digits than its factorization.

5643660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 5643660 is about 2375.6388614434. The cubic root of 5643660 is about 178.0411048445.

It can be divided in two parts, 564 and 3660, that added together give a palindrome (4224).

The spelling of 5643660 in words is "five million, six hundred forty-three thousand, six hundred sixty".