12720320540 has 24 divisors (see below), whose sum is σ = 26721585072. Its totient is φ = 5086430720.

The previous prime is 12720320521. The next prime is 12720320549. The reversal of 12720320540 is 4502302721.

It is a super-4 number, since 4×12720320540⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720320549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43754 + ... + 165393.

It is an arithmetic number, because the mean of its divisors is an integer number (1113399378).

Almost surely, 2^12720320540 is an apocalyptic number.

12720320540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12720320540 is an abundant number, since it is smaller than the sum of its proper divisors (14001264532).

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

12720320540 is a wasteful number, since it uses less digits than its factorization.

12720320540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212197 (or 212195 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The spelling of 12720320540 in words is "twelve billion, seven hundred twenty million, three hundred twenty thousand, five hundred forty".