216728084 has 12 divisors (see below), whose sum is σ = 388094784. Its totient is φ = 105843864.

The previous prime is 216728081. The next prime is 216728089. The reversal of 216728084 is 480827612.

It is a super-2 number, since 2×216728084² = 93942124788622112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216728081) 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 3 ways as a sum of consecutive naturals, for example, 629852 + ... + 630195.

It is an arithmetic number, because the mean of its divisors is an integer number (32341232).

Almost surely, 2^216728084 is an apocalyptic number.

It is an amenable number.

216728084 is a deficient number, since it is larger than the sum of its proper divisors (171366700).

216728084 is a wasteful number, since it uses less digits than its factorization.

216728084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260094 (or 1260092 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 216728084 is about 14721.6875391376. The cubic root of 216728084 is about 600.6733957993.

It can be divided in two parts, 2167 and 28084, that multiplied together give a triangular number (60858028 = T₁₁₀₃₂).

The spelling of 216728084 in words is "two hundred sixteen million, seven hundred twenty-eight thousand, eighty-four".