12780765 has 24 divisors (see below), whose sum is σ = 22284288. Its totient is φ = 6776160.

The previous prime is 12780763. The next prime is 12780797. The reversal of 12780765 is 56708721.

It is not a de Polignac number, because 12780765 - 2¹ = 12780763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12780763) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7852 + ... + 9338.

It is an arithmetic number, because the mean of its divisors is an integer number (928512).

Almost surely, 2^12780765 is an apocalyptic number.

12780765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12780765 is a deficient number, since it is larger than the sum of its proper divisors (9503523).

12780765 is a wasteful number, since it uses less digits than its factorization.

12780765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 12780765 is about 3575.0195803660. The cubic root of 12780765 is about 233.8041863951.

The spelling of 12780765 in words is "twelve million, seven hundred eighty thousand, seven hundred sixty-five".