12640026306 has 64 divisors (see below), whose sum is σ = 26388311040. Its totient is φ = 4033765440.

The previous prime is 12640026283. The next prime is 12640026313. The reversal of 12640026306 is 60362004621.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2221341 + ... + 2227023.

It is an arithmetic number, because the mean of its divisors is an integer number (412317360).

Almost surely, 2^12640026306 is an apocalyptic number.

12640026306 is an abundant number, since it is smaller than the sum of its proper divisors (13748284734).

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

12640026306 is a wasteful number, since it uses less digits than its factorization.

12640026306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911.

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 12640026306 in words is "twelve billion, six hundred forty million, twenty-six thousand, three hundred six".