216169380 has 108 divisors (see below), whose sum is σ = 762800220. Its totient is φ = 49408128.

The previous prime is 216169379. The next prime is 216169397. The reversal of 216169380 is 83961612.

216169380 is a `hidden beast` number, since 2 + 1 + 616 + 9 + 38 + 0 = 666.

216169380 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 146313216 + 69856164 = 12096^2 + 8358^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3435 + ... + 21074.

It is an arithmetic number, because the mean of its divisors is an integer number (7062965).

Almost surely, 2^216169380 is an apocalyptic number.

216169380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216169380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381400110).

216169380 is an abundant number, since it is smaller than the sum of its proper divisors (546630840).

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

216169380 is a wasteful number, since it uses less digits than its factorization.

216169380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24538 (or 24526 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 216169380 is about 14702.6997520863. The cubic root of 216169380 is about 600.1567923567.

The spelling of 216169380 in words is "two hundred sixteen million, one hundred sixty-nine thousand, three hundred eighty".