216129320 has 64 divisors (see below), whose sum is σ = 534176640. Its totient is φ = 78048000.

The previous prime is 216129301. The next prime is 216129343. The reversal of 216129320 is 23921612.

It is a self number, because there is not a number n which added to its sum of digits gives 216129320.

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, 64814 + ... + 68066.

It is an arithmetic number, because the mean of its divisors is an integer number (8346510).

Almost surely, 2^216129320 is an apocalyptic number.

216129320 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 216129320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267088320).

216129320 is an abundant number, since it is smaller than the sum of its proper divisors (318047320).

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

216129320 is a wasteful number, since it uses less digits than its factorization.

216129320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426 (or 3422 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 216129320 is about 14701.3373541321. The cubic root of 216129320 is about 600.1197168523.

The spelling of 216129320 in words is "two hundred sixteen million, one hundred twenty-nine thousand, three hundred twenty".