2646644 has 48 divisors (see below), whose sum is σ = 6228096. Its totient is φ = 950400.

The previous prime is 2646641. The next prime is 2646649. The reversal of 2646644 is 4466462.

It is a self number, because there is not a number n which added to its sum of digits gives 2646644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2646641) 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, 3674 + ... + 4334.

It is an arithmetic number, because the mean of its divisors is an integer number (129752).

2^2646644 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 2646644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3114048).

2646644 is an abundant number, since it is smaller than the sum of its proper divisors (3581452).

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

2646644 is a wasteful number, since it uses less digits than its factorization.

2646644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 694 counting only the distinct ones).

The product of its digits is 27648, while the sum is 32.

The square root of 2646644 is about 1626.8509458460. The cubic root of 2646644 is about 138.3243090192.

It can be divided in two parts, 2 and 646644, that added together give a palindrome (646646).

The spelling of 2646644 in words is "two million, six hundred forty-six thousand, six hundred forty-four".