216234585 has 48 divisors (see below), whose sum is σ = 443139840. Its totient is φ = 95437440.

The previous prime is 216234581. The next prime is 216234589. The reversal of 216234585 is 585432612.

216234585 is a `hidden beast` number, since 21 + 623 + 4 + 5 + 8 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (216234581) and next prime (216234589).

It is not a de Polignac number, because 216234585 - 2² = 216234581 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216234581) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2701 + ... + 20970.

It is an arithmetic number, because the mean of its divisors is an integer number (9232080).

Almost surely, 2^216234585 is an apocalyptic number.

It is an amenable number.

216234585 is an abundant number, since it is smaller than the sum of its proper divisors (226905255).

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

216234585 is a wasteful number, since it uses less digits than its factorization.

216234585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23718 (or 23715 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 216234585 is about 14704.9170347881. The cubic root of 216234585 is about 600.2171297483.

The spelling of 216234585 in words is "two hundred sixteen million, two hundred thirty-four thousand, five hundred eighty-five".