2540065720 has 64 divisors (see below), whose sum is σ = 5980677120. Its totient is φ = 969074304.

The previous prime is 2540065709. The next prime is 2540065721. The reversal of 2540065720 is 275600452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540065721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333879 + ... + 341401.

It is an arithmetic number, because the mean of its divisors is an integer number (93448080).

Almost surely, 2^2540065720 is an apocalyptic number.

2540065720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2540065720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2990338560).

2540065720 is an abundant number, since it is smaller than the sum of its proper divisors (3440611400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2540065720 is a wasteful number, since it uses less digits than its factorization.

2540065720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924 (or 7920 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 2540065720 is about 50399.0646738608. The cubic root of 2540065720 is about 1364.4207572410.

The spelling of 2540065720 in words is "two billion, five hundred forty million, sixty-five thousand, seven hundred twenty".