216604395 has 128 divisors (see below), whose sum is σ = 474163200. Its totient is φ = 91570176.

The previous prime is 216604387. The next prime is 216604403. The reversal of 216604395 is 593406612.

It is a happy number.

216604395 is a `hidden beast` number, since 2 + 16 + 604 + 39 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (216604387) and next prime (216604403).

It is not a de Polignac number, because 216604395 - 2³ = 216604387 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1558236 + ... + 1558374.

It is an arithmetic number, because the mean of its divisors is an integer number (3704400).

Almost surely, 2^216604395 is an apocalyptic number.

216604395 is an abundant number, since it is smaller than the sum of its proper divisors (257558805).

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

216604395 is a wasteful number, since it uses less digits than its factorization.

216604395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 216604395 is about 14717.4860285308. The cubic root of 216604395 is about 600.5591038430.

The spelling of 216604395 in words is "two hundred sixteen million, six hundred four thousand, three hundred ninety-five".