12640276540 has 24 divisors (see below), whose sum is σ = 26577919872. Its totient is φ = 5049760320.

The previous prime is 12640276511. The next prime is 12640276549. The reversal of 12640276540 is 4567204621.

12640276540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 12640276540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640276549) 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, 380556 + ... + 412435.

It is an arithmetic number, because the mean of its divisors is an integer number (1107413328).

Almost surely, 2^12640276540 is an apocalyptic number.

12640276540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12640276540 is an abundant number, since it is smaller than the sum of its proper divisors (13937643332).

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

12640276540 is a wasteful number, since it uses less digits than its factorization.

12640276540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793797 (or 793795 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

It can be divided in two parts, 12640 and 276540, that added together give a triangular number (289180 = T₇₆₀).

The spelling of 12640276540 in words is "twelve billion, six hundred forty million, two hundred seventy-six thousand, five hundred forty".