12805520 has 80 divisors (see below), whose sum is σ = 36664320. Its totient is φ = 4050432.

The previous prime is 12805519. The next prime is 12805523. The reversal of 12805520 is 2550821.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (12805523) 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, 6401 + ... + 8159.

It is an arithmetic number, because the mean of its divisors is an integer number (458304).

Almost surely, 2^12805520 is an apocalyptic number.

12805520 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 12805520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18332160).

12805520 is an abundant number, since it is smaller than the sum of its proper divisors (23858800).

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

12805520 is a wasteful number, since it uses less digits than its factorization.

12805520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 12805520 is about 3578.4801242986. The cubic root of 12805520 is about 233.9550404284.

The spelling of 12805520 in words is "twelve million, eight hundred five thousand, five hundred twenty".