216817632 has 72 divisors (see below), whose sum is σ = 633270456. Its totient is φ = 70315776.

The previous prime is 216817589. The next prime is 216817639. The reversal of 216817632 is 236718612.

216817632 is a `hidden beast` number, since 2 + 1 + 6 + 8 + 17 + 632 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216817639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 483 + ... + 20829.

It is an arithmetic number, because the mean of its divisors is an integer number (8795423).

Almost surely, 2^216817632 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 216817632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316635228).

216817632 is an abundant number, since it is smaller than the sum of its proper divisors (416452824).

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

216817632 is a wasteful number, since it uses less digits than its factorization.

216817632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20400 (or 20389 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 216817632 is about 14724.7285883306. The cubic root of 216817632 is about 600.7561134206.

The spelling of 216817632 in words is "two hundred sixteen million, eight hundred seventeen thousand, six hundred thirty-two".