12864558 has 80 divisors (see below), whose sum is σ = 32267520. Its totient is φ = 3408048.

The previous prime is 12864541. The next prime is 12864559. The reversal of 12864558 is 85546821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12864559) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 273691 + ... + 273737.

It is an arithmetic number, because the mean of its divisors is an integer number (403344).

Almost surely, 2^12864558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12864558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16133760).

12864558 is an abundant number, since it is smaller than the sum of its proper divisors (19402962).

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

12864558 is an equidigital number, since it uses as much as digits as its factorization.

12864558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 78 counting only the distinct ones).

The product of its digits is 76800, while the sum is 39.

The square root of 12864558 is about 3586.7196712316. The cubic root of 12864558 is about 234.3140279441.

The spelling of 12864558 in words is "twelve million, eight hundred sixty-four thousand, five hundred fifty-eight".