2635644 has 48 divisors (see below), whose sum is σ = 6886656. Its totient is φ = 777600.

The previous prime is 2635643. The next prime is 2635673. The reversal of 2635644 is 4465362.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2635643) 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, 5169 + ... + 5655.

It is an arithmetic number, because the mean of its divisors is an integer number (143472).

2^2635644 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 2635644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3443328).

2635644 is an abundant number, since it is smaller than the sum of its proper divisors (4251012).

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

2635644 is a wasteful number, since it uses less digits than its factorization.

2635644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 544 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

The square root of 2635644 is about 1623.4666611914. The cubic root of 2635644 is about 138.1324080983.

The spelling of 2635644 in words is "two million, six hundred thirty-five thousand, six hundred forty-four".