216171080 has 32 divisors (see below), whose sum is σ = 487634040. Its totient is φ = 86246400.

The previous prime is 216171061. The next prime is 216171083. The reversal of 216171080 is 80171612.

It can be written as a sum of positive squares in 4 ways, for example, as 216031204 + 139876 = 14698^2 + 374^2 .

It is not an unprimeable number, because it can be changed into a prime (216171083) 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, 9302 + ... + 22778.

Almost surely, 2^216171080 is an apocalyptic number.

216171080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216171080 is an abundant number, since it is smaller than the sum of its proper divisors (271462960).

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

216171080 is a wasteful number, since it uses less digits than its factorization.

216171080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13889 (or 13885 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 216171080 is about 14702.7575644843. The cubic root of 216171080 is about 600.1583656043.

The spelling of 216171080 in words is "two hundred sixteen million, one hundred seventy-one thousand, eighty".