216542250 has 96 divisors (see below), whose sum is σ = 590221008. Its totient is φ = 57283200.

The previous prime is 216542237. The next prime is 216542267. The reversal of 216542250 is 52245612.

216542250 is a `hidden beast` number, since 2 + 1 + 654 + 2 + 2 + 5 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 17816841 + 198725409 = 4221^2 + 14097^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 352944 + ... + 353556.

Almost surely, 2^216542250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216542250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295110504).

216542250 is an abundant number, since it is smaller than the sum of its proper divisors (373678758).

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

216542250 is a wasteful number, since it uses less digits than its factorization.

216542250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 216542250 is about 14715.3746129686. The cubic root of 216542250 is about 600.5016637722.

Adding to 216542250 its reverse (52245612), we get a palindrome (268787862).

The spelling of 216542250 in words is "two hundred sixteen million, five hundred forty-two thousand, two hundred fifty".