12865320 has 96 divisors (see below), whose sum is σ = 45045000. Its totient is φ = 3165696.

The previous prime is 12865319. The next prime is 12865331. The reversal of 12865320 is 2356821.

12865320 is a `hidden beast` number, since 1 + 2 + 8 + 653 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5280804 + 7584516 = 2298^2 + 2754^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3306 + ... + 6054.

Almost surely, 2^12865320 is an apocalyptic number.

12865320 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 12865320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22522500).

12865320 is an abundant number, since it is smaller than the sum of its proper divisors (32179680).

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

12865320 is a wasteful number, since it uses less digits than its factorization.

12865320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779 (or 2772 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 12865320 is about 3586.8258948547. The cubic root of 12865320 is about 234.3186541884.

The spelling of 12865320 in words is "twelve million, eight hundred sixty-five thousand, three hundred twenty".