12187770728 has 16 divisors (see below), whose sum is σ = 26116651680. Its totient is φ = 5223330288.

The previous prime is 12187770709. The next prime is 12187770743. The reversal of 12187770728 is 82707778121.

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 3 ways as a sum of consecutive naturals, for example, 108819326 + ... + 108819437.

It is an arithmetic number, because the mean of its divisors is an integer number (1632290730).

Almost surely, 2^12187770728 is an apocalyptic number.

It is an amenable number.

12187770728 is an abundant number, since it is smaller than the sum of its proper divisors (13928880952).

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

12187770728 is a wasteful number, since it uses less digits than its factorization.

12187770728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217638776 (or 217638772 counting only the distinct ones).

The product of its (nonzero) digits is 614656, while the sum is 50.

The spelling of 12187770728 in words is "twelve billion, one hundred eighty-seven million, seven hundred seventy thousand, seven hundred twenty-eight".