5638668 has 48 divisors (see below), whose sum is σ = 15832320. Its totient is φ = 1525824.

The previous prime is 5638663. The next prime is 5638691. The reversal of 5638668 is 8668365.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (5638663) 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, 171 + ... + 3362.

It is an arithmetic number, because the mean of its divisors is an integer number (329840).

Almost surely, 2^5638668 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 5638668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7916160).

5638668 is an abundant number, since it is smaller than the sum of its proper divisors (10193652).

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

5638668 is a wasteful number, since it uses less digits than its factorization.

5638668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566 (or 3564 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 5638668 is about 2374.5879642582. The cubic root of 5638668 is about 177.9885949853.

The spelling of 5638668 in words is "five million, six hundred thirty-eight thousand, six hundred sixty-eight".