12687880386978 has 64 divisors (see below), whose sum is σ = 29683657075200. Its totient is φ = 4006104434640.

The previous prime is 12687880386967. The next prime is 12687880387031. The reversal of 12687880386978 is 87968308878621.

12687880386978 is a `hidden beast` number, since 1 + 2 + 6 + 8 + 78 + 80 + 386 + 97 + 8 = 666.

It is a super-2 number, since 2×12687880386978² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12687880386897 and 12687880386906.

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 31 ways as a sum of consecutive naturals, for example, 6024573 + ... + 7853103.

It is an arithmetic number, because the mean of its divisors is an integer number (463807141800).

Almost surely, 2^{12687880386978} is an apocalyptic number.

12687880386978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12687880386978 is an abundant number, since it is smaller than the sum of its proper divisors (16995776688222).

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

12687880386978 is a wasteful number, since it uses less digits than its factorization.

12687880386978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835324 (or 1835318 counting only the distinct ones).

The product of its (nonzero) digits is 3121348608, while the sum is 81.

The spelling of 12687880386978 in words is "twelve trillion, six hundred eighty-seven billion, eight hundred eighty million, three hundred eighty-six thousand, nine hundred seventy-eight".