5643988 has 36 divisors (see below), whose sum is σ = 11998560. Its totient is φ = 2269296.

The previous prime is 5643973. The next prime is 5644021. The reversal of 5643988 is 8893465.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54745 + ... + 54847.

Almost surely, 2^5643988 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 5643988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5999280).

5643988 is an abundant number, since it is smaller than the sum of its proper divisors (6354572).

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

5643988 is a wasteful number, since it uses less digits than its factorization.

5643988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 131 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 5643988 is about 2375.7078945022. The cubic root of 5643988 is about 178.0445539273.

It can be divided in two parts, 56 and 43988, that added together give a palindrome (44044).

The spelling of 5643988 in words is "five million, six hundred forty-three thousand, nine hundred eighty-eight".