2821644 has 36 divisors (see below), whose sum is σ = 8152144. Its totient is φ = 806112.

The previous prime is 2821627. The next prime is 2821649. The reversal of 2821644 is 4461282.

2821644 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5347 + ... + 5850.

2^2821644 is an apocalyptic number.

It is an amenable number.

2821644 is an abundant number, since it is smaller than the sum of its proper divisors (5330500).

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

2821644 is a wasteful number, since it uses less digits than its factorization.

2821644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11214 (or 11209 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 2821644 is about 1679.7749849310. The cubic root of 2821644 is about 141.3082136639.

The spelling of 2821644 in words is "two million, eight hundred twenty-one thousand, six hundred forty-four".