216535305 has 64 divisors (see below), whose sum is σ = 419328000. Its totient is φ = 93208320.

The previous prime is 216535289. The next prime is 216535321. The reversal of 216535305 is 503535612.

It is an interprime number because it is at equal distance from previous prime (216535289) and next prime (216535321).

It is not a de Polignac number, because 216535305 - 2⁴ = 216535289 is a prime.

It is a super-2 number, since 2×216535305² = 93775076622886050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 620271 + ... + 620619.

It is an arithmetic number, because the mean of its divisors is an integer number (6552000).

Almost surely, 2^216535305 is an apocalyptic number.

It is an amenable number.

216535305 is a deficient number, since it is larger than the sum of its proper divisors (202792695).

216535305 is a wasteful number, since it uses less digits than its factorization.

216535305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694.

The product of its (nonzero) digits is 13500, while the sum is 30.

The square root of 216535305 is about 14715.1386333938. The cubic root of 216535305 is about 600.4952438878.

The spelling of 216535305 in words is "two hundred sixteen million, five hundred thirty-five thousand, three hundred five".