1281087790580 has 48 divisors (see below), whose sum is σ = 2975532828240. Its totient is φ = 460232782848.

The previous prime is 1281087790571. The next prime is 1281087790607. The reversal of 1281087790580 is 850977801821.

It can be written as a sum of positive squares in 8 ways, for example, as 58886787556 + 1222201003024 = 242666^2 + 1105532^2 .

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, 66574985 + ... + 66594224.

It is an arithmetic number, because the mean of its divisors is an integer number (61990267255).

Almost surely, 2^{1281087790580} is an apocalyptic number.

1281087790580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281087790580 is an abundant number, since it is smaller than the sum of its proper divisors (1694445037660).

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

1281087790580 is a wasteful number, since it uses less digits than its factorization.

1281087790580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133169268 (or 133169266 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 56.

The spelling of 1281087790580 in words is "one trillion, two hundred eighty-one billion, eighty-seven million, seven hundred ninety thousand, five hundred eighty".