12785220 has 144 divisors (see below), whose sum is σ = 45252480. Its totient is φ = 2861568.

The previous prime is 12785209. The next prime is 12785221. The reversal of 12785220 is 2258721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12785221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91911 + ... + 92049.

Almost surely, 2^12785220 is an apocalyptic number.

12785220 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 12785220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22626240).

12785220 is an abundant number, since it is smaller than the sum of its proper divisors (32467260).

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

12785220 is a wasteful number, since it uses less digits than its factorization.

12785220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 12785220 is about 3575.6425995896. The cubic root of 12785220 is about 233.8313490010.

The spelling of 12785220 in words is "twelve million, seven hundred eighty-five thousand, two hundred twenty".