216171560 has 32 divisors (see below), whose sum is σ = 530604000. Its totient is φ = 78607680.

The previous prime is 216171533. The next prime is 216171563. The reversal of 216171560 is 65171612.

It is not an unprimeable number, because it can be changed into a prime (216171563) 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, 245210 + ... + 246089.

It is an arithmetic number, because the mean of its divisors is an integer number (16581375).

Almost surely, 2^216171560 is an apocalyptic number.

216171560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216171560 is an abundant number, since it is smaller than the sum of its proper divisors (314432440).

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

216171560 is a wasteful number, since it uses less digits than its factorization.

216171560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491321 (or 491317 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 216171560 is about 14702.7738879437. The cubic root of 216171560 is about 600.1588098139.

The spelling of 216171560 in words is "two hundred sixteen million, one hundred seventy-one thousand, five hundred sixty".