216304515 has 96 divisors (see below), whose sum is σ = 468688896. Its totient is φ = 89994240.

The previous prime is 216304483. The next prime is 216304537. The reversal of 216304515 is 515403612.

216304515 is a `hidden beast` number, since 21 + 630 + 4 + 5 + 1 + 5 = 666.

It is not a de Polignac number, because 216304515 - 2⁵ = 216304483 is a prime.

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 95 ways as a sum of consecutive naturals, for example, 165354 + ... + 166656.

It is an arithmetic number, because the mean of its divisors is an integer number (4882176).

Almost surely, 2^216304515 is an apocalyptic number.

216304515 is an abundant number, since it is smaller than the sum of its proper divisors (252384381).

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

216304515 is a wasteful number, since it uses less digits than its factorization.

216304515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 216304515 is about 14707.2946186578. The cubic root of 216304515 is about 600.2818259362.

The spelling of 216304515 in words is "two hundred sixteen million, three hundred four thousand, five hundred fifteen".