216171450 has 96 divisors (see below), whose sum is σ = 649869120. Its totient is φ = 52401600.

The previous prime is 216171443. The next prime is 216171451. The reversal of 216171450 is 54171612.

It is a happy number.

216171450 is a `hidden beast` number, since 2 + 1 + 617 + 1 + 45 + 0 = 666.

216171450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (216171451) 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, 7572 + ... + 22128.

It is an arithmetic number, because the mean of its divisors is an integer number (6769470).

Almost surely, 2^216171450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216171450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324934560).

216171450 is an abundant number, since it is smaller than the sum of its proper divisors (433697670).

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

216171450 is a wasteful number, since it uses less digits than its factorization.

216171450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14589 (or 14578 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 216171450 is about 14702.7701471525. The cubic root of 216171450 is about 600.1587080159.

The spelling of 216171450 in words is "two hundred sixteen million, one hundred seventy-one thousand, four hundred fifty".