1287881441280 has 1800 divisors, whose sum is σ = 5711320342728. Its totient is φ = 275867762688.

The previous prime is 1287881441227. The next prime is 1287881441291. The reversal of 1287881441280 is 821441887821.

1287881441280 is a `hidden beast` number, since 1 + 2 + 8 + 78 + 81 + 4 + 412 + 80 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 120236949504 + 1167644491776 = 346752^2 + 1080576^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5527388044 + ... + 5527388276.

Almost surely, 2^{1287881441280} is an apocalyptic number.

1287881441280 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 1287881441280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2855660171364).

1287881441280 is an abundant number, since it is smaller than the sum of its proper divisors (4423438901448).

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

1287881441280 is an equidigital number, since it uses as much as digits as its factorization.

1287881441280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 1835008, while the sum is 54.

The spelling of 1287881441280 in words is "one trillion, two hundred eighty-seven billion, eight hundred eighty-one million, four hundred forty-one thousand, two hundred eighty".