12806784 has 48 divisors (see below), whose sum is σ = 36856170. Its totient is φ = 4268544.

The previous prime is 12806749. The next prime is 12806861. The reversal of 12806784 is 48760821.

It can be written as a sum of positive squares in only one way, i.e., 12446784 + 360000 = 3528^2 + 600^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4407 + ... + 6710.

Almost surely, 2^12806784 is an apocalyptic number.

It is an amenable number.

12806784 is an abundant number, since it is smaller than the sum of its proper divisors (24049386).

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

12806784 is a wasteful number, since it uses less digits than its factorization.

12806784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11137 (or 11122 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 12806784 is about 3578.6567312331. The cubic root of 12806784 is about 233.9627378756.

The spelling of 12806784 in words is "twelve million, eight hundred six thousand, seven hundred eighty-four".