12638746880 has 36 divisors (see below), whose sum is σ = 30273751452. Its totient is φ = 5055498240.

The previous prime is 12638746867. The next prime is 12638746927. The reversal of 12638746880 is 8864783621.

It can be written as a sum of positive squares in 2 ways, for example, as 9388834816 + 3249912064 = 96896^2 + 57008^2 .

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, 4935731 + ... + 4938290.

Almost surely, 2^12638746880 is an apocalyptic number.

12638746880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12638746880 is an abundant number, since it is smaller than the sum of its proper divisors (17635004572).

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

12638746880 is an frugal number, since it uses more digits than its factorization.

12638746880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9874042 (or 9874028 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 12638746880 in words is "twelve billion, six hundred thirty-eight million, seven hundred forty-six thousand, eight hundred eighty".