3665688 has 64 divisors (see below), whose sum is σ = 10214400. Its totient is φ = 1088640.

The previous prime is 3665677. The next prime is 3665731. The reversal of 3665688 is 8865663.

3665688 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

Its product of digits (207360) is a multiple of the sum of its prime factors (432).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9483 + ... + 9861.

It is an arithmetic number, because the mean of its divisors is an integer number (159600).

Almost surely, 2^3665688 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 3665688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5107200).

3665688 is an abundant number, since it is smaller than the sum of its proper divisors (6548712).

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

3665688 is a wasteful number, since it uses less digits than its factorization.

3665688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 428 counting only the distinct ones).

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

The square root of 3665688 is about 1914.5986524596. The cubic root of 3665688 is about 154.1884464319.

The spelling of 3665688 in words is "three million, six hundred sixty-five thousand, six hundred eighty-eight".