216812499228 has 192 divisors, whose sum is σ = 633441894400. Its totient is φ = 63674242560.

The previous prime is 216812499187. The next prime is 216812499229. The reversal of 216812499228 is 822994218612.

216812499228 is a `hidden beast` number, since 216 + 81 + 249 + 92 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216812499229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3143133 + ... + 3211371.

Almost surely, 2^216812499228 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 216812499228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316720947200).

216812499228 is an abundant number, since it is smaller than the sum of its proper divisors (416629395172).

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

216812499228 is a wasteful number, since it uses less digits than its factorization.

216812499228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68369 (or 68361 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 216812499228 in words is "two hundred sixteen billion, eight hundred twelve million, four hundred ninety-nine thousand, two hundred twenty-eight".