216571056 has 40 divisors (see below), whose sum is σ = 602513520. Its totient is φ = 66637056.

The previous prime is 216571051. The next prime is 216571057. The reversal of 216571056 is 650175612.

It is not an unprimeable number, because it can be changed into a prime (216571051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172911 + ... + 174158.

It is an arithmetic number, because the mean of its divisors is an integer number (15062838).

Almost surely, 2^216571056 is an apocalyptic number.

216571056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

216571056 is an abundant number, since it is smaller than the sum of its proper divisors (385942464).

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

216571056 is a wasteful number, since it uses less digits than its factorization.

216571056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347093 (or 347087 counting only the distinct ones).

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

The square root of 216571056 is about 14716.3533526482. The cubic root of 216571056 is about 600.5282902680.

The spelling of 216571056 in words is "two hundred sixteen million, five hundred seventy-one thousand, fifty-six".