12721709280 has 288 divisors, whose sum is σ = 49359645216. Its totient is φ = 2736685056.

The previous prime is 12721709249. The next prime is 12721709309. The reversal of 12721709280 is 8290712721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 383932 + ... + 415748.

It is an arithmetic number, because the mean of its divisors is an integer number (171387657).

Almost surely, 2^12721709280 is an apocalyptic number.

12721709280 is a gapful number since it is divisible by the number (10) 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 12721709280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24679822608).

12721709280 is an abundant number, since it is smaller than the sum of its proper divisors (36637935936).

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

12721709280 is a wasteful number, since it uses less digits than its factorization.

12721709280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31866 (or 31851 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The spelling of 12721709280 in words is "twelve billion, seven hundred twenty-one million, seven hundred nine thousand, two hundred eighty".