3657216 has 40 divisors (see below), whose sum is σ = 9747144. Its totient is φ = 1218560.

The previous prime is 3657187. The next prime is 3657217. The reversal of 3657216 is 6127563.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3657217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346 + ... + 2726.

Almost surely, 2^3657216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3657216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4873572).

3657216 is an abundant number, since it is smaller than the sum of its proper divisors (6089928).

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

3657216 is an equidigital number, since it uses as much as digits as its factorization.

3657216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402 (or 2386 counting only the distinct ones).

The product of its digits is 7560, while the sum is 30.

The square root of 3657216 is about 1912.3848984972. The cubic root of 3657216 is about 154.0695699611.

The spelling of 3657216 in words is "three million, six hundred fifty-seven thousand, two hundred sixteen".