12378987264 has 144 divisors (see below), whose sum is σ = 38169754112. Its totient is φ = 3488292864.

The previous prime is 12378987259. The next prime is 12378987281. The reversal of 12378987264 is 46278987321.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376677 + ... + 408219.

Almost surely, 2^12378987264 is an apocalyptic number.

12378987264 is a gapful number since it is divisible by the number (14) 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 12378987264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19084877056).

12378987264 is an abundant number, since it is smaller than the sum of its proper divisors (25790766848).

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

12378987264 is an equidigital number, since it uses as much as digits as its factorization.

12378987264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31642 (or 31628 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 57.

Adding to 12378987264 its sum of digits (57), we get a palindrome (12378987321).

The spelling of 12378987264 in words is "twelve billion, three hundred seventy-eight million, nine hundred eighty-seven thousand, two hundred sixty-four".