12638339760 has 40 divisors (see below), whose sum is σ = 39178854000. Its totient is φ = 3370223872.

The previous prime is 12638339743. The next prime is 12638339761. The reversal of 12638339760 is 6793383621.

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

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (12638339761) 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, 26329635 + ... + 26330114.

It is an arithmetic number, because the mean of its divisors is an integer number (979471350).

Almost surely, 2^12638339760 is an apocalyptic number.

12638339760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12638339760 is an abundant number, since it is smaller than the sum of its proper divisors (26540514240).

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

12638339760 is a wasteful number, since it uses less digits than its factorization.

12638339760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52659765 (or 52659759 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 12638339760 in words is "twelve billion, six hundred thirty-eight million, three hundred thirty-nine thousand, seven hundred sixty".