2544640 has 88 divisors (see below), whose sum is σ = 7074432. Its totient is φ = 860160.

The previous prime is 2544637. The next prime is 2544643. The reversal of 2544640 is 464452.

It is an interprime number because it is at equal distance from previous prime (2544637) and next prime (2544643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2544643) 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 7 ways as a sum of consecutive naturals, for example, 35805 + ... + 35875.

2^2544640 is an apocalyptic number.

2544640 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 2544640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3537216).

2544640 is an abundant number, since it is smaller than the sum of its proper divisors (4529792).

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

2544640 is an equidigital number, since it uses as much as digits as its factorization.

2544640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 2544640 is about 1595.1927783187. The cubic root of 2544640 is about 136.5239305591.

The spelling of 2544640 in words is "two million, five hundred forty-four thousand, six hundred forty".