12646780 has 48 divisors (see below), whose sum is σ = 29191680. Its totient is φ = 4580928.

The previous prime is 12646771. The next prime is 12646801. The reversal of 12646780 is 8764621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8017 + ... + 9463.

It is an arithmetic number, because the mean of its divisors is an integer number (608160).

Almost surely, 2^12646780 is an apocalyptic number.

12646780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12646780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14595840).

12646780 is an abundant number, since it is smaller than the sum of its proper divisors (16544900).

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

12646780 is a wasteful number, since it uses less digits than its factorization.

12646780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 12646780 is about 3556.2311510924. The cubic root of 12646780 is about 232.9842990151.

The spelling of 12646780 in words is "twelve million, six hundred forty-six thousand, seven hundred eighty".