12878609787684 has 63 divisors (see below), whose sum is σ = 33791401297857. Its totient is φ = 4292805333024.

The previous prime is 12878609787677. The next prime is 12878609787721. The reversal of 12878609787684 is 48678790687821.

The square root of 12878609787684 is 3588678.

It is a perfect power (a square), and thus also a powerful number.

12878609787684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2531631032100 + 10346978755584 = 1591110^2 + 3216672^2 .

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 193755384 + ... + 193821840.

Almost surely, 2^{12878609787684} is an apocalyptic number.

12878609787684 is the 3588678-th square number.

It is an amenable number.

12878609787684 is an abundant number, since it is smaller than the sum of its proper divisors (20912791510173).

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

12878609787684 is an frugal number, since it uses more digits than its factorization.

12878609787684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132936 (or 66462 counting only the distinct ones).

The product of its (nonzero) digits is 3641573376, while the sum is 81.

12878609787684 divided by its sum of digits (81) gives a square (158995182564 = 398742²).

The spelling of 12878609787684 in words is "twelve trillion, eight hundred seventy-eight billion, six hundred nine million, seven hundred eighty-seven thousand, six hundred eighty-four".