1280671616728 has 64 divisors (see below), whose sum is σ = 2839759488000. Its totient is φ = 529777729152.

The previous prime is 1280671616711. The next prime is 1280671616759. The reversal of 1280671616728 is 8276161760821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5510053 + ... + 5737771.

It is an arithmetic number, because the mean of its divisors is an integer number (44371242000).

Almost surely, 2^{1280671616728} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280671616728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1419879744000).

1280671616728 is an abundant number, since it is smaller than the sum of its proper divisors (1559087871272).

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

1280671616728 is a wasteful number, since it uses less digits than its factorization.

1280671616728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231224 (or 231220 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 1280671616728 in words is "one trillion, two hundred eighty billion, six hundred seventy-one million, six hundred sixteen thousand, seven hundred twenty-eight".