2640844 has 12 divisors (see below), whose sum is σ = 4635904. Its totient is φ = 1316304.

The previous prime is 2640823. The next prime is 2640853. The reversal of 2640844 is 4480462.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757 + ... + 2419.

2^2640844 is an apocalyptic number.

It is an amenable number.

2640844 is a deficient number, since it is larger than the sum of its proper divisors (1995060).

2640844 is a wasteful number, since it uses less digits than its factorization.

2640844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064 (or 2062 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 2640844 is about 1625.0673832183. The cubic root of 2640844 is about 138.2231913067.

The spelling of 2640844 in words is "two million, six hundred forty thousand, eight hundred forty-four".