216019872 has 60 divisors (see below), whose sum is σ = 635316066. Its totient is φ = 72005760.

The previous prime is 216019861. The next prime is 216019879. The reversal of 216019872 is 278910612.

It can be written as a sum of positive squares in only one way, i.e., 141991056 + 74028816 = 11916^2 + 8604^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (216019879) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 39079 + ... + 44262.

Almost surely, 2^216019872 is an apocalyptic number.

It is an amenable number.

216019872 is an abundant number, since it is smaller than the sum of its proper divisors (419296194).

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

216019872 is an equidigital number, since it uses as much as digits as its factorization.

216019872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83363 (or 83346 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 216019872 is about 14697.6145003194. The cubic root of 216019872 is about 600.0183994358.

The spelling of 216019872 in words is "two hundred sixteen million, nineteen thousand, eight hundred seventy-two".