12720795840 has 336 divisors, whose sum is σ = 45952111296. Its totient is φ = 3223756800.

The previous prime is 12720795839. The next prime is 12720795851. The reversal of 12720795840 is 4859702721.

It is a happy number.

It is a super-2 number, since 2×12720795840² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 11988910 + ... + 11989970.

It is an arithmetic number, because the mean of its divisors is an integer number (136762236).

Almost surely, 2^12720795840 is an apocalyptic number.

12720795840 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 12720795840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22976055648).

12720795840 is an abundant number, since it is smaller than the sum of its proper divisors (33231315456).

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

12720795840 is a wasteful number, since it uses less digits than its factorization.

12720795840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288 (or 1275 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 12720795840 in words is "twelve billion, seven hundred twenty million, seven hundred ninety-five thousand, eight hundred forty".