12644047276 has 12 divisors (see below), whose sum is σ = 25288094608. Its totient is φ = 5418877392.

The previous prime is 12644047267. The next prime is 12644047303. The reversal of 12644047276 is 67274044621.

12644047276 is an admirable number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 225786531 + ... + 225786586.

Almost surely, 2^12644047276 is an apocalyptic number.

It is an amenable number.

12644047276 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12644047276 is a wasteful number, since it uses less digits than its factorization.

12644047276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451573128 (or 451573126 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 43.

The spelling of 12644047276 in words is "twelve billion, six hundred forty-four million, forty-seven thousand, two hundred seventy-six".