3644568 has 64 divisors (see below), whose sum is σ = 10368000. Its totient is φ = 1185696.

The previous prime is 3644513. The next prime is 3644569. The reversal of 3644568 is 8654463.

3644568 is a `hidden beast` number, since 3 + 644 + 5 + 6 + 8 = 666.

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

It is a d-powerful number, because it can be written as 3¹³ + 6⁴ + 4² + 4⁷ + 5⁹ + 6⁶ + 8⁵ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644569) 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, 9973 + ... + 10331.

It is an arithmetic number, because the mean of its divisors is an integer number (162000).

Almost surely, 2^3644568 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 3644568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5184000).

3644568 is an abundant number, since it is smaller than the sum of its proper divisors (6723432).

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

3644568 is a wasteful number, since it uses less digits than its factorization.

3644568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 411 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 3644568 is about 1909.0751687663. The cubic root of 3644568 is about 153.8917550462.

The spelling of 3644568 in words is "three million, six hundred forty-four thousand, five hundred sixty-eight".