2639745609 has 32 divisors (see below), whose sum is σ = 3626112000. Its totient is φ = 1707566400.

The previous prime is 2639745593. The next prime is 2639745611. The reversal of 2639745609 is 9065479362.

2639745609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2639745609 - 2⁴ = 2639745593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2639745629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7563567 + ... + 7563915.

It is an arithmetic number, because the mean of its divisors is an integer number (113316000).

Almost surely, 2^2639745609 is an apocalyptic number.

It is an amenable number.

2639745609 is a deficient number, since it is larger than the sum of its proper divisors (986366391).

2639745609 is a wasteful number, since it uses less digits than its factorization.

2639745609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845.

The product of its (nonzero) digits is 2449440, while the sum is 51.

The square root of 2639745609 is about 51378.4547159605. The cubic root of 2639745609 is about 1382.0402519127.

The spelling of 2639745609 in words is "two billion, six hundred thirty-nine million, seven hundred forty-five thousand, six hundred nine".