216538196 has 24 divisors (see below), whose sum is σ = 443150400. Its totient is φ = 90643392.

The previous prime is 216538187. The next prime is 216538207. The reversal of 216538196 is 691835612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88721 + ... + 91128.

It is an arithmetic number, because the mean of its divisors is an integer number (18464600).

Almost surely, 2^216538196 is an apocalyptic number.

It is an amenable number.

216538196 is an abundant number, since it is smaller than the sum of its proper divisors (226612204).

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

216538196 is a wasteful number, since it uses less digits than its factorization.

216538196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179903 (or 179901 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 216538196 is about 14715.2368652360. The cubic root of 216538196 is about 600.4979163142.

The spelling of 216538196 in words is "two hundred sixteen million, five hundred thirty-eight thousand, one hundred ninety-six".