12978864 has 60 divisors (see below), whose sum is σ = 36589176. Its totient is φ = 4294656.

The previous prime is 12978859. The next prime is 12978883. The reversal of 12978864 is 46887921.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27559 + ... + 28025.

Almost surely, 2^12978864 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 12978864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18294588).

12978864 is an abundant number, since it is smaller than the sum of its proper divisors (23610312).

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

12978864 is a wasteful number, since it uses less digits than its factorization.

12978864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674 (or 665 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 12978864 is about 3602.6190473043. The cubic root of 12978864 is about 235.0059693670.

The spelling of 12978864 in words is "twelve million, nine hundred seventy-eight thousand, eight hundred sixty-four".