216864288 has 36 divisors (see below), whose sum is σ = 616708638. Its totient is φ = 72288000.

The previous prime is 216864269. The next prime is 216864331. The reversal of 216864288 is 882468612.

216864288 is a `hidden beast` number, since 216 + 8 + 6 + 428 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 183548304 + 33315984 = 13548^2 + 5772^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 376213 + ... + 376788.

Almost surely, 2^216864288 is an apocalyptic number.

It is an amenable number.

216864288 is an abundant number, since it is smaller than the sum of its proper divisors (399844350).

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

216864288 is a wasteful number, since it uses less digits than its factorization.

216864288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753017 (or 753006 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 216864288 is about 14726.3127767951. The cubic root of 216864288 is about 600.7992016552.

The spelling of 216864288 in words is "two hundred sixteen million, eight hundred sixty-four thousand, two hundred eighty-eight".