12657216 has 112 divisors (see below), whose sum is σ = 39428928. Its totient is φ = 3532800.

The previous prime is 12657209. The next prime is 12657217. The reversal of 12657216 is 61275621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12657217) 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, 27226 + ... + 27686.

It is an arithmetic number, because the mean of its divisors is an integer number (352044).

Almost surely, 2^12657216 is an apocalyptic number.

12657216 is a gapful number since it is divisible by the number (16) 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 12657216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19714464).

12657216 is an abundant number, since it is smaller than the sum of its proper divisors (26771712).

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

12657216 is a wasteful number, since it uses less digits than its factorization.

12657216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 490 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 12657216 is about 3557.6981322198. The cubic root of 12657216 is about 233.0483668557.

The spelling of 12657216 in words is "twelve million, six hundred fifty-seven thousand, two hundred sixteen".