12987512538 has 256 divisors, whose sum is σ = 35982213120. Its totient is φ = 3016569600.

The previous prime is 12987512537. The next prime is 12987512539. The reversal of 12987512538 is 83521578921.

It is an interprime number because it is at equal distance from previous prime (12987512537) and next prime (12987512539).

It is not an unprimeable number, because it can be changed into a prime (12987512537) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 39237033 + ... + 39237363.

It is an arithmetic number, because the mean of its divisors is an integer number (140555520).

Almost surely, 2^12987512538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12987512538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17991106560).

12987512538 is an abundant number, since it is smaller than the sum of its proper divisors (22994700582).

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

12987512538 is a wasteful number, since it uses less digits than its factorization.

12987512538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553.

The product of its digits is 1209600, while the sum is 51.

It can be divided in two parts, 12987 and 512538, that added together give a palindrome (525525).

The spelling of 12987512538 in words is "twelve billion, nine hundred eighty-seven million, five hundred twelve thousand, five hundred thirty-eight".