216545436 has 72 divisors (see below), whose sum is σ = 580179600. Its totient is φ = 67979520.

The previous prime is 216545431. The next prime is 216545443. The reversal of 216545436 is 634545612.

216545436 is a `hidden beast` number, since 216 + 5 + 4 + 5 + 436 = 666.

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

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 216545436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216545431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40275 + ... + 45333.

It is an arithmetic number, because the mean of its divisors is an integer number (8058050).

Almost surely, 2^216545436 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 216545436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290089800).

216545436 is an abundant number, since it is smaller than the sum of its proper divisors (363634164).

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

216545436 is a wasteful number, since it uses less digits than its factorization.

216545436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139 (or 5134 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 216545436 is about 14715.4828666952. The cubic root of 216545436 is about 600.5046088309.

The spelling of 216545436 in words is "two hundred sixteen million, five hundred forty-five thousand, four hundred thirty-six".