1287920195808 has 192 divisors, whose sum is σ = 3550311088128. Its totient is φ = 408321768960.

The previous prime is 1287920195803. The next prime is 1287920195843. The reversal of 1287920195808 is 8085910297821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287920195803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40424941 + ... + 40456787.

It is an arithmetic number, because the mean of its divisors is an integer number (18491203584).

Almost surely, 2^{1287920195808} 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 1287920195808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1775155544064).

1287920195808 is an abundant number, since it is smaller than the sum of its proper divisors (2262390892320).

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

1287920195808 is a wasteful number, since it uses less digits than its factorization.

1287920195808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32125 (or 32117 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 60.

The spelling of 1287920195808 in words is "one trillion, two hundred eighty-seven billion, nine hundred twenty million, one hundred ninety-five thousand, eight hundred eight".