216530540 has 24 divisors (see below), whose sum is σ = 455302512. Its totient is φ = 86500160.

The previous prime is 216530537. The next prime is 216530569. The reversal of 216530540 is 45035612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9827 + ... + 23013.

It is an arithmetic number, because the mean of its divisors is an integer number (18970938).

Almost surely, 2^216530540 is an apocalyptic number.

216530540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216530540 is an abundant number, since it is smaller than the sum of its proper divisors (238771972).

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

216530540 is a wasteful number, since it uses less digits than its factorization.

216530540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14017 (or 14015 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 216530540 is about 14714.9767244124. The cubic root of 216530540 is about 600.4908390929.

The spelling of 216530540 in words is "two hundred sixteen million, five hundred thirty thousand, five hundred forty".