55617216 has 56 divisors (see below), whose sum is σ = 151150320. Its totient is φ = 18035712.

The previous prime is 55617187. The next prime is 55617227. The reversal of 55617216 is 61271655.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3190 + ... + 11018.

Almost surely, 2^55617216 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 55617216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75575160).

55617216 is an abundant number, since it is smaller than the sum of its proper divisors (95533104).

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

55617216 is a wasteful number, since it uses less digits than its factorization.

55617216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7881 (or 7871 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 55617216 is about 7457.6950862850. The cubic root of 55617216 is about 381.7125291680.

The spelling of 55617216 in words is "fifty-five million, six hundred seventeen thousand, two hundred sixteen".