2644540 has 24 divisors (see below), whose sum is σ = 5796000. Its totient is φ = 1011648.

The previous prime is 2644531. The next prime is 2644547. The reversal of 2644540 is 454462.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2415 + ... + 3334.

It is an arithmetic number, because the mean of its divisors is an integer number (241500).

2^2644540 is an apocalyptic number.

2644540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2644540 is an abundant number, since it is smaller than the sum of its proper divisors (3151460).

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

2644540 is a wasteful number, since it uses less digits than its factorization.

2644540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5781 (or 5779 counting only the distinct ones).

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

The square root of 2644540 is about 1626.2041692235. The cubic root of 2644540 is about 138.2876447882.

The spelling of 2644540 in words is "two million, six hundred forty-four thousand, five hundred forty".