12778782 has 8 divisors (see below), whose sum is σ = 25557576. Its totient is φ = 4259592.

The previous prime is 12778771. The next prime is 12778813. The reversal of 12778782 is 28787721.

It is a sphenic number, since it is the product of 3 distinct primes.

12778782 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064893 + ... + 1064904.

It is an arithmetic number, because the mean of its divisors is an integer number (3194697).

Almost surely, 2^12778782 is an apocalyptic number.

12778782 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12778782 is a wasteful number, since it uses less digits than its factorization.

12778782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129802.

The product of its digits is 87808, while the sum is 42.

The square root of 12778782 is about 3574.7422284691. The cubic root of 12778782 is about 233.7920938043.

The spelling of 12778782 in words is "twelve million, seven hundred seventy-eight thousand, seven hundred eighty-two".