216003728 has 20 divisors (see below), whose sum is σ = 427413120. Its totient is φ = 105703584.

The previous prime is 216003713. The next prime is 216003763. The reversal of 216003728 is 827300612.

It is a happy number.

It is a super-2 number, since 2×216003728² = 93315221019795968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216003728.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142868 + ... + 144371.

It is an arithmetic number, because the mean of its divisors is an integer number (21370656).

Almost surely, 2^216003728 is an apocalyptic number.

It is an amenable number.

216003728 is a deficient number, since it is larger than the sum of its proper divisors (211409392).

216003728 is a wasteful number, since it uses less digits than its factorization.

216003728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287294 (or 287288 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 216003728 is about 14697.0652852874. The cubic root of 216003728 is about 600.0034518320.

The spelling of 216003728 in words is "two hundred sixteen million, three thousand, seven hundred twenty-eight".