12778566 has 16 divisors (see below), whose sum is σ = 25881600. Its totient is φ = 4205448.

The previous prime is 12778561. The next prime is 12778627. The reversal of 12778566 is 66587721.

12778566 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 (12778561) 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, 13006 + ... + 13953.

It is an arithmetic number, because the mean of its divisors is an integer number (1617600).

Almost surely, 2^12778566 is an apocalyptic number.

12778566 is an abundant number, since it is smaller than the sum of its proper divisors (13103034).

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

12778566 is a wasteful number, since it uses less digits than its factorization.

12778566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27043.

The product of its digits is 141120, while the sum is 42.

The square root of 12778566 is about 3574.7120163728. The cubic root of 12778566 is about 233.7907765328.

The spelling of 12778566 in words is "twelve million, seven hundred seventy-eight thousand, five hundred sixty-six".