2644040 has 96 divisors (see below), whose sum is σ = 7387200. Its totient is φ = 846720.

The previous prime is 2644039. The next prime is 2644043. The reversal of 2644040 is 404462.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (2644043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37205 + ... + 37275.

It is an arithmetic number, because the mean of its divisors is an integer number (76950).

2^2644040 is an apocalyptic number.

2644040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2644040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3693600).

2644040 is an abundant number, since it is smaller than the sum of its proper divisors (4743160).

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

2644040 is a wasteful number, since it uses less digits than its factorization.

2644040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2644040 is about 1626.0504297223. The cubic root of 2644040 is about 138.2789289459.

The spelling of 2644040 in words is "two million, six hundred forty-four thousand, forty".