12638367860 has 24 divisors (see below), whose sum is σ = 26876532480. Its totient is φ = 4991354784.

The previous prime is 12638367857. The next prime is 12638367869. The reversal of 12638367860 is 6876383621.

It is a junction number, because it is equal to n+sod(n) for n = 12638367799 and 12638367808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638367869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3997904 + ... + 4001063.

It is an arithmetic number, because the mean of its divisors is an integer number (1119855520).

Almost surely, 2^12638367860 is an apocalyptic number.

12638367860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12638367860 is an abundant number, since it is smaller than the sum of its proper divisors (14238164620).

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

12638367860 is a wasteful number, since it uses less digits than its factorization.

12638367860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7999055 (or 7999053 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 12638367860 in words is "twelve billion, six hundred thirty-eight million, three hundred sixty-seven thousand, eight hundred sixty".