216172216 has 32 divisors (see below), whose sum is σ = 455484960. Its totient is φ = 95432832.

The previous prime is 216172211. The next prime is 216172247. The reversal of 216172216 is 612271612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216172211) 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 7 ways as a sum of consecutive naturals, for example, 42795 + ... + 47578.

It is an arithmetic number, because the mean of its divisors is an integer number (14233905).

Almost surely, 2^216172216 is an apocalyptic number.

216172216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

216172216 is an abundant number, since it is smaller than the sum of its proper divisors (239312744).

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

216172216 is a wasteful number, since it uses less digits than its factorization.

216172216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90415 (or 90411 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 216172216 is about 14702.7961966423. The cubic root of 216172216 is about 600.1594168993.

The spelling of 216172216 in words is "two hundred sixteen million, one hundred seventy-two thousand, two hundred sixteen".