12565780 has 12 divisors (see below), whose sum is σ = 26388180. Its totient is φ = 5026304.

The previous prime is 12565769. The next prime is 12565781. The reversal of 12565780 is 8756521.

It can be written as a sum of positive squares in 2 ways, for example, as 7118224 + 5447556 = 2668^2 + 2334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12565781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314125 + ... + 314164.

It is an arithmetic number, because the mean of its divisors is an integer number (2199015).

Almost surely, 2^12565780 is an apocalyptic number.

12565780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12565780 is an abundant number, since it is smaller than the sum of its proper divisors (13822400).

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

12565780 is a wasteful number, since it uses less digits than its factorization.

12565780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628298 (or 628296 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 12565780 is about 3544.8243962149. The cubic root of 12565780 is about 232.4858279410.

The spelling of 12565780 in words is "twelve million, five hundred sixty-five thousand, seven hundred eighty".