1280397894336 has 168 divisors, whose sum is σ = 4004609703744. Its totient is φ = 387908144640.

The previous prime is 1280397894323. The next prime is 1280397894337. The reversal of 1280397894336 is 6334987930821.

1280397894336 is a `hidden beast` number, since 12 + 80 + 39 + 7 + 89 + 433 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (1280397894337) 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 23 ways as a sum of consecutive naturals, for example, 29903535 + ... + 29946321.

Almost surely, 2^{1280397894336} is an apocalyptic number.

1280397894336 is a gapful number since it is divisible by the number (16) 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 1280397894336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2002304851872).

1280397894336 is an abundant number, since it is smaller than the sum of its proper divisors (2724211809408).

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

1280397894336 is a wasteful number, since it uses less digits than its factorization.

1280397894336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47539 (or 47526 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 63.

The spelling of 1280397894336 in words is "one trillion, two hundred eighty billion, three hundred ninety-seven million, eight hundred ninety-four thousand, three hundred thirty-six".