12638756320 has 24 divisors (see below), whose sum is σ = 29859062184. Its totient is φ = 5055502464.

The previous prime is 12638756297. The next prime is 12638756321. The reversal of 12638756320 is 2365783621.

It is a super-2 number, since 2×12638756320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638756321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39495954 + ... + 39496273.

It is an arithmetic number, because the mean of its divisors is an integer number (1244127591).

Almost surely, 2^12638756320 is an apocalyptic number.

12638756320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12638756320 is an abundant number, since it is smaller than the sum of its proper divisors (17220305864).

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

12638756320 is an equidigital number, since it uses as much as digits as its factorization.

12638756320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78992242 (or 78992234 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 12638756320 in words is "twelve billion, six hundred thirty-eight million, seven hundred fifty-six thousand, three hundred twenty".