2540640534 has 16 divisors (see below), whose sum is σ = 5114933760. Its totient is φ = 841271400.

The previous prime is 2540640533. The next prime is 2540640569. The reversal of 2540640534 is 4350460452.

It is a junction number, because it is equal to n+sod(n) for n = 2540640495 and 2540640504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540640533) 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 7 ways as a sum of consecutive naturals, for example, 1401214 + ... + 1403025.

It is an arithmetic number, because the mean of its divisors is an integer number (319683360).

Almost surely, 2^2540640534 is an apocalyptic number.

2540640534 is an abundant number, since it is smaller than the sum of its proper divisors (2574293226).

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

2540640534 is a wasteful number, since it uses less digits than its factorization.

2540640534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2804395.

The product of its (nonzero) digits is 57600, while the sum is 33.

The square root of 2540640534 is about 50404.7669769438. The cubic root of 2540640534 is about 1364.5236717697.

The spelling of 2540640534 in words is "two billion, five hundred forty million, six hundred forty thousand, five hundred thirty-four".