12720997440 has 168 divisors, whose sum is σ = 44686362240. Its totient is φ = 3320054784.

The previous prime is 12720997409. The next prime is 12720997453. The reversal of 12720997440 is 4479902721.

It is a happy number.

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 23 ways as a sum of consecutive naturals, for example, 88371 + ... + 182349.

Almost surely, 2^12720997440 is an apocalyptic number.

12720997440 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 12720997440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22343181120).

12720997440 is an abundant number, since it is smaller than the sum of its proper divisors (31965364800).

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

12720997440 is a wasteful number, since it uses less digits than its factorization.

12720997440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94049 (or 94036 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 12720997440 in words is "twelve billion, seven hundred twenty million, nine hundred ninety-seven thousand, four hundred forty".