216543140 has 48 divisors (see below), whose sum is σ = 508201344. Its totient is φ = 76819200.

The previous prime is 216543139. The next prime is 216543163. The reversal of 216543140 is 41345612.

216543140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2984 + ... + 21023.

It is an arithmetic number, because the mean of its divisors is an integer number (10587528).

Almost surely, 2^216543140 is an apocalyptic number.

216543140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216543140 is an abundant number, since it is smaller than the sum of its proper divisors (291658204).

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

216543140 is a wasteful number, since it uses less digits than its factorization.

216543140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24068 (or 24066 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 216543140 is about 14715.4048534181. The cubic root of 216543140 is about 600.5024864688.

Adding to 216543140 its reverse (41345612), we get a palindrome (257888752).

The spelling of 216543140 in words is "two hundred sixteen million, five hundred forty-three thousand, one hundred forty".