1281717959928 has 256 divisors, whose sum is σ = 3905221939200. Its totient is φ = 342738708480.

The previous prime is 1281717959909. The next prime is 1281717959987. The reversal of 1281717959928 is 8299597171821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48838426 + ... + 48864662.

It is an arithmetic number, because the mean of its divisors is an integer number (15254773200).

Almost surely, 2^{1281717959928} 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 1281717959928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1952610969600).

1281717959928 is an abundant number, since it is smaller than the sum of its proper divisors (2623503979272).

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

1281717959928 is a wasteful number, since it uses less digits than its factorization.

1281717959928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26590 (or 26586 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 69.

The spelling of 1281717959928 in words is "one trillion, two hundred eighty-one billion, seven hundred seventeen million, nine hundred fifty-nine thousand, nine hundred twenty-eight".