216243776 has 28 divisors (see below), whose sum is σ = 490411008. Its totient is φ = 92675712.

The previous prime is 216243767. The next prime is 216243809. The reversal of 216243776 is 677342612.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×216243776² = 93522741317476352, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 240896 + ... + 241791.

Almost surely, 2^216243776 is an apocalyptic number.

It is an amenable number.

216243776 is an abundant number, since it is smaller than the sum of its proper divisors (274167232).

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

216243776 is an equidigital number, since it uses as much as digits as its factorization.

216243776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482706 (or 482696 counting only the distinct ones).

The product of its digits is 84672, while the sum is 38.

The square root of 216243776 is about 14705.2295459813. The cubic root of 216243776 is about 600.2256336570.

The spelling of 216243776 in words is "two hundred sixteen million, two hundred forty-three thousand, seven hundred seventy-six".