216215532 has 144 divisors (see below), whose sum is σ = 619164000. Its totient is φ = 63157248.

The previous prime is 216215491. The next prime is 216215543. The reversal of 216215532 is 235512612.

It is a happy number.

216215532 is a `hidden beast` number, since 2 + 1 + 621 + 5 + 5 + 32 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 216215496 and 216215505.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 1207819 + ... + 1207997.

It is an arithmetic number, because the mean of its divisors is an integer number (4299750).

Almost surely, 2^216215532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216215532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309582000).

216215532 is an abundant number, since it is smaller than the sum of its proper divisors (402948468).

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

216215532 is a wasteful number, since it uses less digits than its factorization.

216215532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 315 counting only the distinct ones).

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

The square root of 216215532 is about 14704.2691759910. The cubic root of 216215532 is about 600.1995003253.

The spelling of 216215532 in words is "two hundred sixteen million, two hundred fifteen thousand, five hundred thirty-two".