2540068729 has 4 divisors (see below), whose sum is σ = 2770984080. Its totient is φ = 2309153380.

The previous prime is 2540068717. The next prime is 2540068757. The reversal of 2540068729 is 9278600452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2540068729 - 2¹⁷ = 2539937657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540078729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115457659 + ... + 115457680.

It is an arithmetic number, because the mean of its divisors is an integer number (692746020).

Almost surely, 2^2540068729 is an apocalyptic number.

It is an amenable number.

2540068729 is a deficient number, since it is larger than the sum of its proper divisors (230915351).

2540068729 is a wasteful number, since it uses less digits than its factorization.

2540068729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230915350.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 2540068729 is about 50399.0945255964. The cubic root of 2540068729 is about 1364.4212960119.

The spelling of 2540068729 in words is "two billion, five hundred forty million, sixty-eight thousand, seven hundred twenty-nine".