217056056 has 32 divisors (see below), whose sum is σ = 472752480. Its totient is φ = 91497600.

The previous prime is 217056031. The next prime is 217056071. The reversal of 217056056 is 650650712.

It is a happy number.

217056056 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×217056056² = 94226662892550272, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28355 + ... + 35186.

It is an arithmetic number, because the mean of its divisors is an integer number (14773515).

Almost surely, 2^217056056 is an apocalyptic number.

It is an amenable number.

217056056 is an abundant number, since it is smaller than the sum of its proper divisors (255696424).

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

217056056 is a wasteful number, since it uses less digits than its factorization.

217056056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63615 (or 63611 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 217056056 is about 14732.8224044139. The cubic root of 217056056 is about 600.9762403594.

The spelling of 217056056 in words is "two hundred seventeen million, fifty-six thousand, fifty-six".