12506278528 has 32 divisors (see below), whose sum is σ = 25265783520. Its totient is φ = 6165062400.

The previous prime is 12506278513. The next prime is 12506278549. The reversal of 12506278528 is 82587260521.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678978 + ... + 697153.

It is an arithmetic number, because the mean of its divisors is an integer number (789555735).

Almost surely, 2^12506278528 is an apocalyptic number.

It is an amenable number.

12506278528 is an abundant number, since it is smaller than the sum of its proper divisors (12759504992).

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

12506278528 is an equidigital number, since it uses as much as digits as its factorization.

12506278528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376216 (or 1376204 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 12506278528 in words is "twelve billion, five hundred six million, two hundred seventy-eight thousand, five hundred twenty-eight".