216133740 has 72 divisors (see below), whose sum is σ = 690122160. Its totient is φ = 54601344.

The previous prime is 216133739. The next prime is 216133747. The reversal of 216133740 is 47331612.

216133740 is a `hidden beast` number, since 2 + 1 + 613 + 3 + 7 + 40 = 666.

216133740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216133747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28179 + ... + 35018.

It is an arithmetic number, because the mean of its divisors is an integer number (9585030).

Almost surely, 2^216133740 is an apocalyptic number.

216133740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216133740 is an abundant number, since it is smaller than the sum of its proper divisors (473988420).

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

216133740 is a wasteful number, since it uses less digits than its factorization.

216133740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63231 (or 63226 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 216133740 is about 14701.4876798234. The cubic root of 216133740 is about 600.1238077843.

It can be divided in two parts, 216 and 133740, that added together give a square (133956 = 366²).

The spelling of 216133740 in words is "two hundred sixteen million, one hundred thirty-three thousand, seven hundred forty".