2002644 has 60 divisors (see below), whose sum is σ = 5989984. Its totient is φ = 571536.

The previous prime is 2002643. The next prime is 2002661. The reversal of 2002644 is 4462002.

2002644 is a `hidden beast` number, since 20 + 0 + 2 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002643) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1827 + ... + 2709.

2^2002644 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 2002644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2994992).

2002644 is an abundant number, since it is smaller than the sum of its proper divisors (3987340).

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

2002644 is a wasteful number, since it uses less digits than its factorization.

2002644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 2002644 is about 1415.1480487921. The cubic root of 2002644 is about 126.0476010623.

Adding to 2002644 its reverse (4462002), we get a palindrome (6464646).

The spelling of 2002644 in words is "two million, two thousand, six hundred forty-four".