12764778 has 32 divisors (see below), whose sum is σ = 28242816. Its totient is φ = 3820608.

The previous prime is 12764767. The next prime is 12764783. The reversal of 12764778 is 87746721.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675 + ... + 5097.

It is an arithmetic number, because the mean of its divisors is an integer number (882588).

Almost surely, 2^12764778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12764778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14121408).

12764778 is an abundant number, since it is smaller than the sum of its proper divisors (15478038).

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

12764778 is a wasteful number, since it uses less digits than its factorization.

12764778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4478.

The product of its digits is 131712, while the sum is 42.

The square root of 12764778 is about 3572.7829489069. The cubic root of 12764778 is about 233.7066599659.

The spelling of 12764778 in words is "twelve million, seven hundred sixty-four thousand, seven hundred seventy-eight".