12798000078 has 128 divisors (see below), whose sum is σ = 29671723008. Its totient is φ = 3656024064.

The previous prime is 12798000013. The next prime is 12798000091. The reversal of 12798000078 is 87000089721.

12798000078 is a nontrivial binomial coefficient, being equal to C(159988, 2).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4078126 + ... + 4081262.

It is an arithmetic number, because the mean of its divisors is an integer number (231810336).

Almost surely, 2^12798000078 is an apocalyptic number.

12798000078 is the 159987-th triangular number and also the 79994-th hexagonal number.

12798000078 is an abundant number, since it is smaller than the sum of its proper divisors (16873722930).

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

12798000078 is a wasteful number, since it uses less digits than its factorization.

12798000078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266.

The product of its (nonzero) digits is 56448, while the sum is 42.

Adding to 12798000078 its reverse (87000089721), we get a palindrome (99798089799).

The spelling of 12798000078 in words is "twelve billion, seven hundred ninety-eight million, seventy-eight", and thus it is an aban number.