216320546 has 24 divisors (see below), whose sum is σ = 371218260. Its totient is φ = 93964032.

The previous prime is 216320539. The next prime is 216320549. The reversal of 216320546 is 645023612.

It can be written as a sum of positive squares in 6 ways, for example, as 171898321 + 44422225 = 13111^2 + 6665^2 .

It is not an unprimeable number, because it can be changed into a prime (216320549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6881 + ... + 21908.

Almost surely, 2^216320546 is an apocalyptic number.

216320546 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216320546 is a deficient number, since it is larger than the sum of its proper divisors (154897714).

216320546 is a wasteful number, since it uses less digits than its factorization.

216320546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28838 (or 28821 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 216320546 is about 14707.8396102215. The cubic root of 216320546 is about 600.2966551539.

The spelling of 216320546 in words is "two hundred sixteen million, three hundred twenty thousand, five hundred forty-six".