12687745840 has 160 divisors (see below), whose sum is σ = 36866640384. Its totient is φ = 3945093120.

The previous prime is 12687745817. The next prime is 12687745841. The reversal of 12687745840 is 4854778621.

It is not an unprimeable number, because it can be changed into a prime (12687745841) 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, 2812867 + ... + 2817373.

Almost surely, 2^12687745840 is an apocalyptic number.

12687745840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12687745840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18433320192).

12687745840 is an abundant number, since it is smaller than the sum of its proper divisors (24178894544).

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

12687745840 is a wasteful number, since it uses less digits than its factorization.

12687745840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995 (or 4989 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 12687745840 in words is "twelve billion, six hundred eighty-seven million, seven hundred forty-five thousand, eight hundred forty".