12778432 has 28 divisors (see below), whose sum is σ = 26462736. Its totient is φ = 6110720.

The previous prime is 12778427. The next prime is 12778433. The reversal of 12778432 is 23487721.

12778432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2869 + ... + 5812.

Almost surely, 2^12778432 is an apocalyptic number.

It is an amenable number.

12778432 is an abundant number, since it is smaller than the sum of its proper divisors (13684304).

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

12778432 is an equidigital number, since it uses as much as digits as its factorization.

12778432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8716 (or 8706 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 12778432 is about 3574.6932735551. The cubic root of 12778432 is about 233.7899593291.

The spelling of 12778432 in words is "twelve million, seven hundred seventy-eight thousand, four hundred thirty-two".