2640020044 has 6 divisors (see below), whose sum is σ = 4620035084. Its totient is φ = 1320010020.

The previous prime is 2640020023. The next prime is 2640020059. The reversal of 2640020044 is 4400200462.

It is a junction number, because it is equal to n+sod(n) for n = 2640019997 and 2640020024.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330002502 + ... + 330002509.

Almost surely, 2^2640020044 is an apocalyptic number.

It is an amenable number.

2640020044 is a deficient number, since it is larger than the sum of its proper divisors (1980015040).

2640020044 is a wasteful number, since it uses less digits than its factorization.

2640020044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660005015 (or 660005013 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 2640020044 is about 51381.1253672007. The cubic root of 2640020044 is about 1382.0881437844.

It can be divided in two parts, 2 and 640020044, that added together give a palindrome (640020046).

The spelling of 2640020044 in words is "two billion, six hundred forty million, twenty thousand, forty-four".