216897912 has 384 divisors, whose sum is σ = 807667200. Its totient is φ = 53887680.

The previous prime is 216897899. The next prime is 216897953. The reversal of 216897912 is 219798612.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9430333 + ... + 9430355.

It is an arithmetic number, because the mean of its divisors is an integer number (2103300).

Almost surely, 2^216897912 is an apocalyptic number.

216897912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216897912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403833600).

216897912 is an abundant number, since it is smaller than the sum of its proper divisors (590769288).

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

216897912 is a wasteful number, since it uses less digits than its factorization.

216897912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 46 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 216897912 is about 14727.4543625163. The cubic root of 216897912 is about 600.8302506100.

The spelling of 216897912 in words is "two hundred sixteen million, eight hundred ninety-seven thousand, nine hundred twelve".