216572868 has 72 divisors (see below), whose sum is σ = 580900320. Its totient is φ = 67841280.

The previous prime is 216572861. The next prime is 216572869. The reversal of 216572868 is 868275612.

216572868 is a `hidden beast` number, since 2 + 16 + 572 + 8 + 68 = 666.

It is not an unprimeable number, because it can be changed into a prime (216572861) 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 23 ways as a sum of consecutive naturals, for example, 88396 + ... + 90812.

It is an arithmetic number, because the mean of its divisors is an integer number (8068060).

Almost surely, 2^216572868 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 216572868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290450160).

216572868 is an abundant number, since it is smaller than the sum of its proper divisors (364327452).

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

216572868 is a wasteful number, since it uses less digits than its factorization.

216572868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577 (or 2572 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 216572868 is about 14716.4149166840. The cubic root of 216572868 is about 600.5299650905.

The spelling of 216572868 in words is "two hundred sixteen million, five hundred seventy-two thousand, eight hundred sixty-eight".