12778512 has 40 divisors (see below), whose sum is σ = 33640704. Its totient is φ = 4178304.

The previous prime is 12778499. The next prime is 12778517. The reversal of 12778512 is 21587721.

It is not an unprimeable number, because it can be changed into a prime (12778517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33 + ... + 5055.

Almost surely, 2^12778512 is an apocalyptic number.

12778512 is a gapful number since it is divisible by the number (12) 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 12778512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16820352).

12778512 is an abundant number, since it is smaller than the sum of its proper divisors (20862192).

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

12778512 is a wasteful number, since it uses less digits than its factorization.

12778512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087 (or 5081 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 12778512 is about 3574.7044633088. The cubic root of 12778512 is about 233.7904472126.

The spelling of 12778512 in words is "twelve million, seven hundred seventy-eight thousand, five hundred twelve".