216538872 has 32 divisors (see below), whose sum is σ = 590561280. Its totient is φ = 65617760.

The previous prime is 216538871. The next prime is 216538873. The reversal of 216538872 is 278835612.

It is an interprime number because it is at equal distance from previous prime (216538871) and next prime (216538873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216538871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409848 + ... + 410375.

It is an arithmetic number, because the mean of its divisors is an integer number (18455040).

Almost surely, 2^216538872 is an apocalyptic number.

216538872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

216538872 is an abundant number, since it is smaller than the sum of its proper divisors (374022408).

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

216538872 is a wasteful number, since it uses less digits than its factorization.

216538872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820243 (or 820239 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 216538872 is about 14715.2598346071. The cubic root of 216538872 is about 600.4985412019.

The spelling of 216538872 in words is "two hundred sixteen million, five hundred thirty-eight thousand, eight hundred seventy-two".