2644005 has 48 divisors (see below), whose sum is σ = 5270400. Its totient is φ = 1108224.

The previous prime is 2644003. The next prime is 2644007. The reversal of 2644005 is 5004462.

2644005 = T₁₉₆ + T₁₉₇ + ... + T₂₈₅.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2644003) and next prime (2644007).

It is not a de Polignac number, because 2644005 - 2¹ = 2644003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17671 + ... + 17819.

It is an arithmetic number, because the mean of its divisors is an integer number (109800).

2^2644005 is an apocalyptic number.

It is an amenable number.

2644005 is a deficient number, since it is larger than the sum of its proper divisors (2626395).

2644005 is a wasteful number, since it uses less digits than its factorization.

2644005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 2644005 is about 1626.0396674128. The cubic root of 2644005 is about 138.2783187958.

Adding to 2644005 its reverse (5004462), we get a palindrome (7648467).

The spelling of 2644005 in words is "two million, six hundred forty-four thousand, five".