3665664 has 108 divisors (see below), whose sum is σ = 11107096. Its totient is φ = 1161216.

The previous prime is 3665653. The next prime is 3665677. The reversal of 3665664 is 4665663.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 85227 + ... + 85269.

Almost surely, 2^3665664 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 3665664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5553548).

3665664 is an abundant number, since it is smaller than the sum of its proper divisors (7441432).

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

3665664 is a wasteful number, since it uses less digits than its factorization.

3665664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 85 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 3665664 is about 1914.5923848172. The cubic root of 3665664 is about 154.1881099302.

Subtracting 3665664 from its reverse (4665663), we obtain a palindrome (999999).

The spelling of 3665664 in words is "three million, six hundred sixty-five thousand, six hundred sixty-four".