12756666 has 32 divisors (see below), whose sum is σ = 27897408. Its totient is φ = 3864960.

The previous prime is 12756661. The next prime is 12756673. The reversal of 12756666 is 66665721.

12756666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (12756661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4006 + ... + 6446.

It is an arithmetic number, because the mean of its divisors is an integer number (871794).

Almost surely, 2^12756666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12756666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13948704).

12756666 is an abundant number, since it is smaller than the sum of its proper divisors (15140742).

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

12756666 is a wasteful number, since it uses less digits than its factorization.

12756666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526.

The product of its digits is 90720, while the sum is 39.

The square root of 12756666 is about 3571.6475190030. The cubic root of 12756666 is about 233.6571427145.

It can be divided in two parts, 127566 and 66, that multiplied together give a triangular number (8419356 = T₄₁₀₃).

The spelling of 12756666 in words is "twelve million, seven hundred fifty-six thousand, six hundred sixty-six".