12957786408 has 128 divisors (see below), whose sum is σ = 38340760320. Its totient is φ = 3572674560.

The previous prime is 12957786403. The next prime is 12957786431. The reversal of 12957786408 is 80468775921.

It is not an unprimeable number, because it can be changed into a prime (12957786403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 531216 + ... + 555072.

It is an arithmetic number, because the mean of its divisors is an integer number (299537190).

Almost surely, 2^12957786408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12957786408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19170380160).

12957786408 is an abundant number, since it is smaller than the sum of its proper divisors (25382973912).

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

12957786408 is a wasteful number, since it uses less digits than its factorization.

12957786408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23987 (or 23983 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 12957786408 in words is "twelve billion, nine hundred fifty-seven million, seven hundred eighty-six thousand, four hundred eight".