12638775280 has 40 divisors (see below), whose sum is σ = 29450682000. Its totient is φ = 5044236288.

The previous prime is 12638775271. The next prime is 12638775323. The reversal of 12638775280 is 8257783621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140010 + ... + 211849.

It is an arithmetic number, because the mean of its divisors is an integer number (736267050).

Almost surely, 2^12638775280 is an apocalyptic number.

12638775280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12638775280 is an abundant number, since it is smaller than the sum of its proper divisors (16811906720).

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

12638775280 is a wasteful number, since it uses less digits than its factorization.

12638775280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352321 (or 352315 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 12638775280 in words is "twelve billion, six hundred thirty-eight million, seven hundred seventy-five thousand, two hundred eighty".