5665638 has 16 divisors (see below), whose sum is σ = 12361536. Its totient is φ = 1716840.

The previous prime is 5665631. The next prime is 5665661. The reversal of 5665638 is 8365665.

It is a junction number, because it is equal to n+sod(n) for n = 5665596 and 5665605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42856 + ... + 42987.

It is an arithmetic number, because the mean of its divisors is an integer number (772596).

Almost surely, 2^5665638 is an apocalyptic number.

5665638 is an abundant number, since it is smaller than the sum of its proper divisors (6695898).

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

5665638 is a wasteful number, since it uses less digits than its factorization.

5665638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85859.

The product of its digits is 129600, while the sum is 39.

The square root of 5665638 is about 2380.2600698243. The cubic root of 5665638 is about 178.2719195368.

The spelling of 5665638 in words is "five million, six hundred sixty-five thousand, six hundred thirty-eight".