12785856 has 28 divisors (see below), whose sum is σ = 33829752. Its totient is φ = 4261888.

The previous prime is 12785821. The next prime is 12785863. The reversal of 12785856 is 65858721.

It is a super-2 number, since 2×12785856² = 326956227305472, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33105 + ... + 33488.

Almost surely, 2^12785856 is an apocalyptic number.

12785856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12785856 is an abundant number, since it is smaller than the sum of its proper divisors (21043896).

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

12785856 is an equidigital number, since it uses as much as digits as its factorization.

12785856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66608 (or 66598 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 12785856 is about 3575.7315335467. The cubic root of 12785856 is about 233.8352262455.

The spelling of 12785856 in words is "twelve million, seven hundred eighty-five thousand, eight hundred fifty-six".