1287960798578 has 16 divisors (see below), whose sum is σ = 1941998459544. Its totient is φ = 640628822400.

The previous prime is 1287960798557. The next prime is 1287960798601. The reversal of 1287960798578 is 8758970697821.

It can be written as a sum of positive squares in 4 ways, for example, as 1287074367049 + 886431529 = 1134493^2 + 29773^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1287960798499 and 1287960798508.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2906126 + ... + 3319862.

Almost surely, 2^{1287960798578} is an apocalyptic number.

1287960798578 is a deficient number, since it is larger than the sum of its proper divisors (654037660966).

1287960798578 is a wasteful number, since it uses less digits than its factorization.

1287960798578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421837.

The product of its (nonzero) digits is 853493760, while the sum is 77.

The spelling of 1287960798578 in words is "one trillion, two hundred eighty-seven billion, nine hundred sixty million, seven hundred ninety-eight thousand, five hundred seventy-eight".